Exe-7B and 7C Sound ICSE Class-10 Concise Physics Solutions Selina Publishers Chapter-7. We Provide Step by Step Answer of Exercise-7(A), MCQs-7(A), Numericals -7(A), Exercise-7(B), MCQ-7(B), Exercise-7(C), MCQ-7(C) and Numericals -7(C) Questions of Exercise-7 Sound ICSE Class-10 Concise Class-10 . Visit official Website CISCE for detail information about ICSE Board Class-10.
| Board | ICSE |
| Publications | Selina Publication |
| Subject | Physics |
| Class | 10th |
| Chapter-7 | Sound (Exe-7B and 7C) |
| Book Name | Concise |
| Topics | Solution of Exercise-7(A), MCQs-7(A), Numericals -7(A), Exercise-7(B), MCQ-7(B), Exercise-7(C), MCQ-7(C) and Numericals -7(C) |
| Academic Session | 2021-2022 |
Sound ICSE Class-10 Concise Physics Solutions Selina Publishers Chapter-7
-: Select Exercise :-
Exercise-7(A), MCQs-7(A), Numericals -7(A),
Exercise-7(B), MCQ-7(B), Exercise-7(C), MCQ-7(C) and Numericals -7(C)
How to Solve Numericals of Sound ICSE Class-10
Note :- Read all the Chapter-7 Sound to clear concept of Sound topic carefully and solve All the example given in your ICSE text book with Numericals before starting Solution of Chapter – 7 “Sound” exercise. Do not forget Keyword during Solution.
Selina Physics Solution “Sound” Exe- 7 (B)
Page 163
Question 1
What do you understand by free vibrations of a body? Give one example.
Answer 1
The vibrations of a body in the absence of any external force on it are called the free vibrations. Eg.: When we strike the keys of a piano, various strings are set into vibration at their natural frequencies.
Question 2
What is meant by the natural frequency of vibration of a body? Name one factors which it depend?
Answer 2
When each body capable of vibrating is set to vibrate freely and it vibrates with a frequency f. It is the natural frequency of vibration of the body.
The natural frequency of vibration of a body depends on the shape and size of the body.
Question 3 (Exe-7B and 7C Sound ICSE Class-10)
(a) Draw a graph between the displacement from mean position and time for a body executing free vibrations in vacuum.
(b) Where can a body execute the natural vibrations?
Answer 3
(a) 
Displacement-time graph for the free vibrations
(b)
Question 4
State one condition for a body to execute free vibrations.
Answer 4
The free vibrations of a body occur only in vacuum because the presence of medium offer some resistance due to which the amplitude of the vibration does not remain constant, but it continuously decreases
Question 5
(a) Name one factor on which the frequency of sound emitted due to vibration in an air column depends.
(b) How does the frequency depend on the factor stated in part (a).
Answer 5
(a) The frequency of sound emitted due to vibration in an air column depends on the length of the air column.
(b) The factor which influences the frequency of sound is the length of the air column.
As the length of the air column increases, the frequency decreases.
Thus, we can conclude that they are inversely proportional to each other.
f ∝
Page 164
Question 6
State one way of increasing the frequency of a note produced by an air column.
Answer 6
The frequency of the note produced in the air column can be increased by decreasing the length of the air column.
Question 7 (Exe-7B and 7C Sound ICSE Class-10)
State two ways of increasing the frequency of vibration of stretched string.
Answer 7
The frequency of vibration of the stretched string can be increased by increasing the tension in the string, by decreasing the length of the string.
Question 8
How does the frequency of sound given by a stretched string depend on its (a) length, (b) tension?
Answer 8
(a) The frequency of sound is inversely proportional to the length of the string.
f ∝
(b) The frequency of sound is directly proportional to the square root of the tension in the string.
f ∝
Question 9
What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?
Answer 9
A stringed instrument is provided with the provision for adjusting the tension of the string. By varying the tension, we can get the desired frequency.
Question 10
The diagram below in Fig. shows three ways in which the string of an instrument can vibrate.
(a)Which of the diagram shows the principal note?
(b)Which has the frequency four times that of the first?
(c) Which vibration is of longest wavelength?
(d)What is the ratio of the frequency of the vibration in (i) and (ii)?
Answer 10
( a) Diagram (i) is showing the principal note.
(b)Diagram (iii) has frequency four times that of the first.
(c) Diagram (i) is showing longest wavelength.
(d) ratio of the frequency of the vibration in (i) and (ii) is 1:2
Question 11 (Exe-7B and 7C Sound ICSE Class-10)
Explain why strings of different thickness are provided on a stringed instrument.
Answer 11
Strings of different thickness are provided on a stringed instrument to produce different frequency sound waves because the natural frequency of vibration of a stretched string is inversely proportional to the radius (thickness) of the string.
Question 12
A blade, fixed at one end, is made to vibrate by pressing its other end and then releasing it. State one way in which the frequency of vibrations of the blade can be lowered.
Answer 12
The frequency of vibrations of the blade can be lowered by increasing the length of the blade or by sticking a small weight on the blade at its free end.
Question 13
How does the medium affect the amplitude of free vibrations of the body?
Answer 13
The presence of the medium offers some resistance to motion, so the vibrating body continuously loses energy due to which the amplitude of the vibration continuously decreases.
Question 14
What are the damped vibrations? How do they differ from free vibrations? Give one example of each.
Answer 14
The periodic vibrations of a body of decreasing amplitude in the presence of resistive force are called the damped vibrations.
The amplitude of the free vibrations remains constant and vibrations continue forever. But, the amplitude of damped vibrations decreases with time and ultimately the vibrations ceases.
For eg, When a slim branch of a tree is pulled and then released, it makes damped vibrations.
A tuning fork vibrating in air excute damped vibrations.
Question 15
The diagram in figure shows the displacement-time graph of a vibrating body.
(i) Name the kind of vibrations.
(ii) Give one example of such vibration.
(iii) Why is the amplitude of vibrations gradually decreasing?
(iv) What happens to the vibrations of the body after sometime?
Answer 15
(i) Damped vibrations
(ii) Example: When a slim branch of a tree is pulled and then released, it makes damped vibrations.
(iii) The amplitude of vibrations gradually decreases due to the frictional (or resistive) force which the surrounding medium exerts on the body vibrating in it. As a result, the vibrating body continuously loses energy in doing work against the force of friction causing a decrease in its amplitude.
(iv) After sometime, the vibrating body loses all of its energy and stops vibrating.
Question 16 (Exe-7B and 7C Sound ICSE Class-10)
A tuning fork is set into vibrations in air. State whether the vibration are natural or damped ?
Answer 16
The tuning fork vibrates with the damped oscillations.
Question 17
Draw a sketch showing the displacement of a body executing damped vibrations.
Answer 17
Displacement time graph of damped vibrations
Question 18
What are forced vibrations? Give one example to illustrate your answer.
Answer 18
The vibrations of a body which take place under the influence of an external periodic force acting on it, are called the forced vibrations. For example: when guitar is played, the artist forces the strings of the guitar to execute forced vibrations.
Question 19
On keeping the stem of a vibrating tuning fork on the surface of a table, a loud sound is heard. Give reason.
Answer 19
A loud sound is heard only when a special case of forced vibration (resonance) has occurred.
When the frequency of the periodic force applied on a body is equal to the natural frequency of that body, we hear a loud sound called resonance.
It is due to resonance that a loud sound is heard on keeping the stem of a vibrating tuning fork on the surface of a table.
Question 20
State two difference between the free (or natural) and forced vibrations.
Answer 20
1. The vibrations of a body in the absence of any resistive force are called the free vibrations. The vibrations of a body in the presence of an external force are called forced vibrations.
2. In free vibrations, the frequency of vibration depends on the shape and size of the body. In forced vibrations, the frequency is equal to the frequency of the force applied.
Question 21
What is meant by resonance? Describe a simple experiment to illustrate the phenomenon of resonance and explain it.
Answer 21
Resonance is a special case of forced vibrations. When the frequency of an externally applied periodic force on a body is equal to its natural frequency, the body rapidly begins to vibrate with an increased amplitude. This phenomenon is known as resonance.
Mount two identical tuning forks A and B of same frequency upon two separate sound boxes such that their open ends face each other as shown.
If the prong A is struck on a rubber pad, it starts vibrating. On putting A on its sound box, tuning fork B also starts vibrating and a loud sound is heard. The vibrations produced in B are due to resonance.
Question 22 (Exe-7B and 7C Sound ICSE Class-10)
State the condition for the resonance to occur.
Answer 22
Condition for resonance:
Resonance occurs when the frequency of the applied force is exactly equal to the natural frequency of the vibrating body.
Question 23
Complete the following sentence:
Resonance is a special case of _________ vibrations, when the frequency of the driving force is _________ natural frequency of the body.
Answer 23
forced, equal to the
Question 24
State two difference between the forced and resonant vibrations.
Answer 24
| Forced Vibrations | Resonant vibrations |
| These are vibrations of a body under an external periodic force of frequency different than the natural frequency of the body. | These are vibrations of a body under an external periodic force of frequency exactly equal to the natural frequency of the body. |
| The amplitude of the vibration is usually small. | The amplitude of vibration is very large. |
Question 25
Why is a loud sound heard at resonance?
Answer 25
At resonance, the body vibrates with large amplitude thus conveying more energy to the ears so a loud sound is heard.
Question 26
Figure 7.14 shows two tuning forks A and B of the same frequency mounted on separate sound boxes with their open ends facing each other. The fork A is set into vibration. (a) Describe your observation. (b) State the principle illustrated by this experiment.
Answer 26
a)The vibrating tuning fork A produces the forced vibrations in the air column of its sound box. These vibrations are of large amplitude because of the large surface area of air in the sound box. They are communicated to the sound box of the fork B. The air column of B starts vibrating with the frequency of the fork A. Since the frequency of these vibrations is same as the natural frequency of the fork B, the fork B picks up these vibrations and starts vibrating due to resonance.
b)On putting the tuning fork A to vibrate, the other tuning fork B will also start vibrating. The vibrations produced in the second tuning fork B are due to resonance.
Page 165
Question 27 (Exe-7B and 7C Sound ICSE Class-10)
In figure, A, B, C and D are four pendulums suspended from the same elastic string XY. Length of pendulum A and D are equal, while the length of B is smaller and C is longer. The pendulum A is set into vibrations. (a) What is your observation about the vibrations pendulum D ? (b) Give reason for your observation in part (a). (C) What type of vibrations take place i pendulums B and C ? (d) Give reason for the answer in part (c).
Answer 27
(a)Set the pendulum A into vibration by displacing it to one side, normal to its length. It is observed that pendulum D also starts vibrating initially with a small amplitude and ultimately it acquires the same amplitude as the pendulum A initially had. When the amplitude of the pendulum D becomes maximum, the amplitude of the pendulum A becomes minimum since the total energy is constant. After some time the amplitude of the pendulum D will decreases and amplitude of A increases. The exchange of energy takes place only between the pendulums A and D because their natural frequencies are same. The pendulums B and C also vibrate, but with very small amplitudes.
(b) The vibrations produced in pendulum A are communicated as forced vibrations to the other pendulums B, C and D through XY. The pendulums B and C remain in the state of forced vibrations, while the pendulum D comes in the state of resonance.
Question 28
A vibrating tuning fork, held over an air column of a given length with its one end closed, produces a loud audible sound. Name the phenomenon responsible for it and explain the observation.
Answer 28
The phenomenon responsible for producing a loud audible sound is named resonance. The vibrating tuning fork causes the forced vibrations in the air column. For a certain length of air column, a loud sound is heard. This happens when the frequency of the air column becomes equal to the frequency of the tuning fork.
Question 29 (imp)
In the fig. 7.16 A, B, C and D represent test tubes each of height 20 cm which are filled with water up to the heights of 12cm, 14 cm, 16 cm and 18 cm respectively. If a vibrating tuning fork is placed over the mouth of test tube D, a loud sound is heard.
(a)Describe the observations with the tubes A, B and C when the vibrating tuning fork is placed over the mouth of these tubes.
(b)Give the reason for your observation in each tube.
(c)State the principle to illustrate by the above experiment.
Answer 29
No loud sound is heard with the tubes A and C, but a loud sound is heard with the tube
.(a) Resonance occurs with the air column in tube B whereas no resonance occurs in the air column of tubes A and C. The frequency of vibrations of air column in tube B is same as the frequency of vibrations of air column in tube D because the length of the air column in tube D is 20-18 = 2cm and that in tube B is 20-14 = 6 cm (3 times). On the other hand, the frequency of vibrations of air column in tubes A and C is not equal to the frequency vibrations of air column in tube B.
When the frequency of vibrations of air column is equal to the frequency of the vibrating tuning fork, resonance occurs.
Question 30
When a troop crosses a suspension bridge, the soldiers are asked to break steps. Explain the reason.
Answer 30
When a troop crosses a suspension bridge, the soldiers are asked to break steps. The reason is that when soldiers march in steps, all the separate periodic forces exerted by them are in same phase and therefore forced vibrations of a particular frequency are produced in the bridge. Now, if the natural frequency of the bridge happens to be equal to the frequency of the steps, the bridge will vibrate with large amplitude due to resonance and suspension bridge could crumble
Question 31
Why are the stringed instruments like guitar provided with a hollow sound box?
Answer 31
The sound box is constructed such that the column of the air inside it, has a natural frequency which is the same as that of the strings stretched on it, so that when the strings are made to vibrate, the air column inside the box is set into forced vibrations. Since the sound box has a large area, it sets a large volume of air into vibration, the frequency of which is same as that of the string. So, due to resonance a loud sound is produced.
Question 32 (Exe-7B and 7C Sound ICSE Class-10)
How do you tune your radio set to a particular station? Name the phenomenon involved in doing so and define it.
Answer 32
When we tune a radio receiver, we merely adjust the values of the electronic components to produce vibrations of frequency equal to that of the radio waves which we want to receive. When the two frequencies match, due to resonance the energy of the signal of that particular frequency is received from the incoming waves. The signal received is then amplified in the receiver set.
The phenomenon involved is resonance. It is a special case of forced vibrations. When the frequency of an externally applied periodic force on a body is equal to its natural frequency, the body rapidly begins to vibrate with an increased amplitude. This phenomenon is known as resonance.
Selina Concise Physics Solutions “Sound” MCQ- 7 (B)
Page 165
Question 1
A wire stretched between two fixed supports is plucked exactly in the middle and then released. It executes (neglect the resistance of the medium):
(a) Resonant vibrations
(b) natural vibrations
(c) Damped vibrations
(d) Forced vibrations
Answer 1
(b) natural vibrations
Hint: The periodic vibrations of a body of constant amplitude in the absence of any external force on it are called natural vibrations.
Question 2
When a body vibrates under a periodic force, the vibrations of the body are:
(a) natural vibrations
(b) Damped vibrations
(c) Forced vibration
(d) Resonant vibrations
Answer 2
Forced vibrations
Hint: The vibrations of a body which take place under the influence of external periodic force acting on it are called the forced vibrations.
Selina Concise ICSE Physics Solutions “Sound” Exe – 7 (C)
Page 172
Question 1
Name three characteristics of a musical sound.
Answer 1
The following three characteristics of sound are:
1) Loudness
2) Pitch or shrillness
3) Quality or timber.
Question 2
(a)Which of the following quantity determines the loudness of a sound wave?
(i)Wavelength (ii) frequency and (iii) amplitude
(b)How is the loudness related to the quantity mentioned in part (a)
Answer 2
(a)Amplitude – The louder sound corresponds to the wave of large amplitude.
(b)Loudness is directly proportional to the square of amplitude.
Page 173
Question 3
If the amplitude of a wave is doubled, what will be the effect on its loudness?
Answer 3
Loudness will be four times because loudness is directly proportional to the square of amplitude.
Question 4
Two waves of the same pitch have amplitudes in the ratio 1:3. What will be the ratio of their (a) loudness (ii) frequencies?
Answer 4
(a) Ratio of loudness will be 1:9
(b) The ratio of frequency will be 1:1
Question 5
How does the wave pattern of a loud note differ from the soft note? Draw a diagram.
Answer 5
Question 6 (Exe-7B and 7C Sound ICSE Class-10)
Name the unit in which the loudness of sound is measured?
Answer 6
The unit of loudness is phon.
Question 7
Why is the loudness of the sound heard by the plucked wire increased when it is mounted on a sound board?
Answer 7
Because the board provides comparatively a large area and forces a large volume of air to vibrate and thereby increases the sound energy reaching our ears.
Question 8
Define the term intensity of a sound wave. State the unit in which it is measured.
Answer 8
The intensity at any point of the medium is the amount of sound energy passing per second normally through unit area at that point. Its unit is microwatt per metre2.
Question 9
How is the loudness of sound related to the intensity of wave producing it?
Answer 9
Relationship between loudness L and intensity I is given as:
L = K log I, where K is a constant of proportionality.
Question 10
Comment on the statement ‘loudness of sound is a subjective nature, while intensity is an objective nature’
Answer 10
The intensity at any point of the medium is the amount of sound energy passing per second normally through unit area at that point.
The loudness of a sound depends on the energy conveyed by the sound wave near the eardrum of the listener. Loudness, being a sensation, also depends on the sensitivity of the ears of the listener. Thus the loudness of sound of a given intensity may differ from listener to listener. Further, two sounds of the same intensity but of different frequencies may differ in loudness even to the same listener because of the sensitivity of ears is different for different frequencies.
So, loudness is a subjective quantity while intensity being a measurable quantity is an objective quantity for the sound wave.
Question 11
State three factors on which affect the loudness of sound heard by the listener .
Answer 11
The loudness of the sound heard depends on:
1) Loudness is proportional to the square of the amplitude.
2) Loudness is inversely proportional to the square of distance.
3) Loudness depends on the surface area of the vibrating body.
Question 12 (Exe-7B and 7C Sound ICSE Class-10)
The bells of a temple are big in size. Why?
Answer 12
According to the study of bells (called campanology), larger bells provide less resonant frequency.
For a sound wave to travel long distances, it is essential that the frequency of the sound is less.
Also, it is observed that thicker the body of a bell, richer is the quality of sound.
This is the reason the bells of a temple are big in size.
Question 13
Name the unit used to measure the sound level.
Answer 13
Decibel is the unit used to measure the sound level
Question 14
What is the safe limit of sound level in dB for our ears?
Answer 14
Upto 80 dB
Question 15
What is meant by noise pollution? Name one source of sound causing noise pollution.
Answer 15
The disturbance produced in the environment due to undesirable loud and harsh sound of level above 120 dB from the various sources such as loudspeaker, moving vehicles etc. is called noise pollution.
Question 16
What determines the pitch of sound?
Answer 16
Pitch of sound is determined by its wavelength or the frequency. Two notes of the same amplitude and sounded on the same instrument will differ in pitch when their vibrations are of different wavelengths or frequencies.
Question 17
Name the subjective property of sound related to its frequency.
Answer 17
Pitch
Question 18
Name and define the characteristic which enables one to distinguish two sounds of same loudness, but of different frequencies given by the same instrument.
Answer 18
Pitch is the characteristic of sound which enables us to distinguish different frequencies sound. Pitch is the characteristic of sound by which an acute note can be distinguished from a grave or flat note.
Question 19
Draw a diagram to show the wave pattern of high pitch note and a low pitch note, but of the same loudness.
Answer 19
The first diagram is high pitch note and second one is low pitch note.
Question 20 (Exe-7B and 7C Sound ICSE Class-10)
How is it possible to detect the filling of a bottle under a water tap by hearing the sound at a distance?
Answer 20
As the water level in a bottle kept under a water tap rises, the length of air column decreases, so the frequency of sound produced increases i.e., sound becomes shriller and shriller. Thus by hearing sound from a distance, one can get the idea of water level in the bottle.
Question 21
The frequencies of notes given by flute, guitar and trumpet are respectively 400Hz, 200Hz and 500 Hz. Which one of these has the highest pitch?
Answer 21
Trumpet. Because its frequency is highest.
Question 22
Complete the following sentences:
(a)The pitch of sound increases, if its frequency ___________.
(b)If the amplitude of the sound is halved, its intensity becomes __________.
Answer 22
(a) increases
(b) one-fourth
Question 23 ( imp)
The diagram below shows three different modes of vibration P, Q and R of the same string of a givens length.
(a) Which vibration will produce a louder sound and why?
(b) Which vibration will produce sound of maximum shrillness (or pitch) and why?
(c) What is the ratio of wavelength of vibrations P and R?
Answer 23
(a) R will produce maximum sound because it has maximum amplitude.
(b) P will produce maximum shrillness because it has maximum frequency.
(c) Lets suppose string has length l
Then wavelength of P=2l/3
Wavelength of R=2l
Question 24
Name the characteristic which enables one to distinguish the sound of two musical instruments even if they are of the same pitch and same loudness.
Answer 24
Quality or timber of sound.
Question 25
How do the two sounds of same loudness and same pitch produced by different instruments differ? Draw diagrams to illustrate your answer.
Answer 25
The two sounds of same loudness and same pitch produced by different instruments differ due to their different wave forms.
The wave forms depend on the number of the subsidiary notes and their relative amplitude along with the principal note.
Diagram below shows the wave patterns of two sounds of same loudness and same pitch but emitted by two different instruments. They produce different sensation to ears because they differ in wave forms: one is a sine wave, while the other is a triangular wave.
Question 26
Two identical guitars are played by two persons to give notes of the same pitch. Will they differ in quality? Give a reason for your answer.
Answer 26
Since the guitars are identical, they will have a similar waveform and so the similar quality.
Question 27
Two musical notes of the same pitch and same loudness are played on two different instruments. Their wave patterns are as shown in the diagram below.
Explain why the wave patterns are different.
Answer 27
Different instruments emit different subsidiary notes. A note played on one instrument has a large number of subsidiary notes while the same note when played on other instrument contains only few subsidiary notes. So they have different wave forms.
Question 28
Which characteristic of sound make it possible to recognize a person by his voice without seeing him?
Answer 28
It is because the vibrations produced by the vocal chord of each person have a characteristic waveform which is different for different persons.
Question 29 (Exe-7B and 7C Sound ICSE Class-10)
State the factors that determine :
(i)The pitch of a note
(ii)The loudness of the sound heard
(iii)The quality of the note
Answer 29
(i)Frequency
(ii)Amplitude
(iii)Waveform
Page 174
Question 30
Name the characteristic of a sound affected due to the change in its
(i) amplitude
(ii) waveform
(iii) frequency.
Answer 30
(i) Loudness
(ii) Quality or timbre
(iii) Pitch
Question 31
The sketches I to IV in Fig show sound waves, all formed n the same interval.
Which diagram shows
(i)A note from a musical instrument
(ii)A soft note
(iii)A bass (low frequency) note
Answer 31
(i)IV
(ii)I
(iii)II
Question 32
Shows the wave patterns of three sounds A, B and C. Name the characteristic of sound which is same between (i) A and B, (ii) B and C, and (iii) C and A.
Answer 32
(i) Since both have same amplitude and waveform therefore loudness and quality is same.
(ii) Neither amplitude nor waveform is same. Hence no characteristic is same.
(iii) Frequency of both the sound is same in this case hence pitch is same.
Question 33
A microphone is connected to the Y-input of a C.R.O. Three different sounds are made in turn in front of the microphone. Their traces (a), (b) and (c) produced on the screen are shown in Fig.
(i)Which trace is due to the loudest sound? Give reason for your answer
(ii)Which trace is due to the sound with the lowest pitch? Explain your answer.
Answer 33
(i)b, since amplitude is largest
(ii)a, since frequency is lowest
Question 34 (Exe-7B and 7C Sound ICSE Class-10)
In what respect does the wave pattern of a noise and a music differ? Draw diagram to explain your answer.
Answer 34
Wave pattern is regular in music while it is quite irregular in noise.
Question 35
State one difference between a musical note and a noise.
Answer 35
Musical note is pleasant, smooth and agreeable to the ear while noise is harsh, discordant and displeasing to the ear.
In musical note, waveform is regular while in noise waveform is irregular.
Selina Physics Solutions “Sound” MCQ- 7 (C)
Page 174
Question 1
By reducing the amplitude of the sound wave, its:
(a) Pitch increases
(b) Loudness decreases
(c) Loudness increases
(d) Pitch decreases
Answer 1
By reducing the amplitude of the sound wave, its loudness decreases.
Hint: Loudness of sound is proportional to the square of the amplitude.
Question 2
Two sounds of same loudness and same pitch produced by two different instruments differ in their:
(a) Amplitudes
(b) Frequencies
(c) Waveforms
(d) All of the above.
Answer 2
Waveforms
Explanation: The waveform of a sound depends on the number of the subsidiary notes and their relative amplitude along with the principal note. The resultant vibration obtained by the superposition of all these vibrations gives the waveform of sound.
Question 3
Two sounds A and B are of same amplitudes, same waveforms but of frequencies f and 2f respectively, then:
(a) B differs in quality from A
(b)Sound of B is grave, A is shrill
(c) and B is shrill, A is grave
(d) while B is louder than A
Answer 3
B is shrill, A is grave
Explanation: Shrillness or pitch of a sound is directly proportional to the frequency of the sound wave. Greater the frequency, shriller will be the note.
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