# Propagation of Sound Waves Exe-8B Very Short Ans Concise Physics ICSE Class 9

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 sessionVisit 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

##### 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-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.

(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.