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9th CBSE
IMPORTANT
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The loudness of sound is measured in terms of

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Important Questions on Sound

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9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Check Your Progress>Q 4
A sound of a single frequency is called
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9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Check Your Progress>Q 5
The quality of a musical note depends on
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9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Check Your Progress>Q 6
The sound produced by a moving bee is shrill and high pitched. Give reason.
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9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Check Your Progress>Q 7

The diagram alongside gives two waveforms A and B of the same amplitude.

a. Which wave will have a higher pitch? Give reasons.

b. Which wave will have grave or flat sound? Why?

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EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Check Your Progress>Q 8
What will happen to the loudness of sound if the distance between the source and the listener is doubled?
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9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Check Your Progress>Q 8
What will happen to the loudness of sound if the amplitude of a wave is tripled?
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9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Check Your Progress>Q 8
What will happen to the loudness of sound if the surface area of the vibrating body is decreased?
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9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Check Your Progress>Q 8
What will happen to the loudness of sound if the density of the medium decreases?