EASY
9th CBSE
IMPORTANT
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What do you understand by the terms, (a) compression, (b) rarefaction as applied to the longitudinal waves?

Important Questions on Sound

EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>EXERCISE>Q 1
Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?
MEDIUM
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>EXERCISE>Q 2
How do the following parameters change in, (a) compression, (b) rarefaction when a longitudinal wave propagates in the air? (i) pressure, (ii) density, (iii) volume, (iv) mass.
EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>Practice Problems>Q 1
A boy counts the number of ripples reaching the shore for 12 seconds. He finds that 72 ripples reach the shore. What is the frequency of the waves?    
EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>Practice Problems>Q 2
A plastic ruler is held near the rotating wheel of a cycle such that it produces sound every time the spoke of the wheel strikes it. If 20 clicks are heard in 0.4 s, calculate the frequency of the sound produced.    
EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>Practice Problems>Q 1
Calculate the frequency of the pendulum of a wall clock, if its time period is 0.25 s.
EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>Practice Problems>Q 2
Calculate the frequency of a sound wave, if its time period is 0.002 s.
EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>Practice Problems>Q 3
A person hears a tone of 500 Hz at a distance of 450 m from the source of sound. What is the time interval between two successive compressions from the source?
MEDIUM
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 5 - Sound>Practice Problems>Q 1
A sound wave of wavelength 0.664 m is travelling through air at a speed of 332 m s-1. What is the frequency of the sound?