Propagation Of Sound Waves Exe-8A Very Short Ans Concise Physics ICSE Class 9 Selina Publishers Solutions. There is the solutions of Very Short Answer type Questions of your latest textbook which is applicable in 2024-25 academic session. Visit official Website CISCE for detail information about ICSE Board Class-9 Physics.
Propagation Of Sound Waves Exe-8A Very Short Ans Concise Physics ICSE Class 9
| Board | ICSE |
| Class | 9 |
| Subject | Physics |
| Writer / Publication | Concise selina Publishers |
| Chapter-8 | Propagation Of Sound Waves |
| Exe-8A | Production and Propagation Of Sound Waves |
| Topics | Solution of Exe-8A Very Short Answer Type |
| Academic Session | 2024-2025 |
Production and Propagation Of Sound Waves
Propagation Of Sound Waves Exe-8A Concise Physics ICSE Class 9 Selina Publishers Solutions
VERY SHORT ANSWER TYPE :
Question-1: What causes sound ?
Answer-1 Sound is caused due to vibrations of a body.
Question-2: Complete the following sentence : Sound is produced by a ….. body.
Answer-2 vibrating
Question-3: There is no atmosphere on moon. Can you hear other people on the moon’s surface?
Answer-3 No.
Question-4: Choose the correct word/words to complete the following sentence:
When sound travels in a medium ………………(the particles of the medium, the source, the disturbance, the medium) travels in form of a wave.
Answer-4 the disturbance
Question-5: Name the two kinds of waves in form of which sound travels in a medium.
Answer-5 Longitudinal and Transverse
Question-6: What is a longitudinal wave? In which medium: solid, liquid or gas, can it be produced ?
Answer-6 Wave in which particles of a medium vibrate about their mean positions, in the direction of propagation of sound is called longitudinal waves. it can be produced in all-solid liquid gases
Question-7: What is a transverse wave? In which medium: solid liquid or gas, can it be produced ?
Answer-7 The wave in which the particles of medium vibrate about their mean positions,in a direction perpendicular to the direction of propagation of wave is called the transverse wave. it can only be produced in solid and surface of liquids.. they can not be produced in liquids and in gases
Question-8: Define the term amplitude of a wave. Write its S.I. unit,
Answer-8 The maximum displacement suffered by the particles of the medium from their mean positions during the wave propagation is called ‘amplitude’ of the wave. It is denoted by A. Its SI unit is metre (m).
Question-9: How is the frequency of a wave related to its time period?
Answer-9 Frequency = 1/time period.
Question-10: Arrange the speed of sound in gases Vg, solids Vs, and liquids Vl, in an ascending order.
Answer-10 Vg<Vl<Vs.
Question-11: State the speed of (i) light and (ii) sound in air?
Answer-11
(i)=>Speed of light = 3 x 10^8 m/s.
(ii)=>Speed of sound = 330 m/s.
Question-12: Answer the following:
(a) Can sound travel in vacuum ?
(b) How does the speed of sound differ in different media?
Answer-12
(a)=> No
(b)=> Speed of sound is maximum in solids, less in liquids and least in gases.
Question-13: Flash of lightning reaches us earlier than the sound of thunder. Explain the reason.
Answer-13 Light travels much faster than sound
Question-14: How does the speed of sound in air vary with temperature?
Answer-14 The speed of sound increases by 0.61 m/s for each 1°C rise in temperature.
Question-15: Complete the following sentences:
(a) Sound cannot travel through ………………; it requires a ……………………..
(b) When sound travels in a medium, the particles of medium …………………… but the disturbance………………
(c) A longitudinal wave is composed of compression and ………………………
(d) A transverse wave is composed of crest and ………………………..
(e) Wave velocity =……………………. x wavelength.
Answer-15 (a)=>vacuum, medium
(b)=>do not move, moves ahead
(c)=> rarefaction
(d)=> trough
(e)=> frequency
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