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 A sonic boom is produced in the air when an aircraft flies at a speed : 

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Important Questions on Sound

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9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>EXERCISE>Q 37
 Sound travels fastest in :
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IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>EXERCISE>Q 38
A boy sitting in a boat fires a gun. An observer P is at a distance of 50 m from the boat. Another observer Q is a diver who is 50 m under the water. Both hear the sound of the gun:
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9th CBSE
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Core Science Physics For Class 9>Chapter 5 - Sound>EXERCISE>Q 39
 When the lightning strikes, we hear multiple of cracks of thunder. These multiple reflections of sound are called _____.
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9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>EXERCISE>Q 40
Hearing of repetition of sound after reflection from a distant object is called :
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9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>EXERCISE>Q 41
For hearing an echo the minimum distance should be:
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9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>EXERCISE>Q 42
An echo is heard only, if the original sound after reflection should reach the ear in :
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9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>EXERCISE>Q 1
Define the following terms :
(a) wavelength, (b) amplitude, (c) frequency, (d) time period, (e) wave velocity
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9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>EXERCISE>Q 2
What do you understand by the term infrasonic vibrations? .