Propagation of Sound Waves Exe-8B Very Short Ans Concise Physics ICSE Class 9 Selina Publishers. 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-8B 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-8B | Infrasonic, Sonic and Ultrasonic Frequency |
| Topics | Solution of Exe-8B Very Short Answer Type |
| Academic Session | 2024-2025 |
Infrasonic, Sonic and Ultrasonic Frequency
Propagation of Sound Waves Exe-8B Very Short Ans Concise Physics ICSE Class 9
VERY SHORT ANSWER TYPE:
Question-1: What do you mean by the audible range of frequency?
Answer- The range of frequency within which the sound can be heard by a human being is called the audible range of frequency.
Question-2: What is the audible range of frequency for humans ?
Answer- The audible range of frequency for humans is 20 Hz to 20 kHz.
Question-3: For which range of frequencies are the human ears most sensitive ?
Answer-2000 Hz to 3000 Hz
Question-4: Which has a higher frequency – ultrasonic sound or infrasonic sound?
Answer- Ultrasonic sound.
Question-5: Complete the following sentences :
(a) An average person can hear sounds of frequencies in the range ……………… to ………………
(b) Ultrasound is of frequency ………………….
(c) Infrasonic sound is of frequency ………………….
(d) Bats can produce and hear ……………….. sound.
(e) Elephants produce ……………….. sound.
Answer-
(a)=>20 Hz, 20 kHz
(b)=>above 20 kHz
(c)=>below 20 Hz
(d)=>ultrasonic
(e)=> infrasonic.
Question-6: Name the sounds of the frequencies given below:
(a) 10 Hz (b) 100 Hz (c) 1000 Hz (d) 40 kHz
Answer- (a)=>infrasonic, (b)=>audible, (c)=>audible, (d)=> ultrasonic.
Question-7: What is ultrasound ?
Answer- Sound of frequency above 20 kHz.
Question-8: State the approximate speed of ultrasound in air.
Answer-330 m/s
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