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Why cannot we...

Question

Why cannot we hear any sound outside a cinema hall whole the show is on?

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Solution

Next time you enter a cinema hall notice the walls and window cloth....
The walls have rough surface and so is the cloth rough and thick... It absorbs the noise (sound as we call it )

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Similar questions

Answer the following.

(1) Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend? Give reasons.

(2) Why can we not hear echo produced in our classroom?

(3) Why are ceilings of concert halls, cinema halls curved?

(4) Which type of waves are sound waves? State their characteristics.

(5) Explain auditory aspects of human ear.

Q. Can we hear any sound on the Moon?

Q. After crossing Sound Barrier will a person be able to hear any sound both from inside and outside

Q. Answer the following questions briefly.
(a) 'A' vibrates 200 times in 5 s, while 'B' vibrates 35 times in 1 s. Which sound will have a lower pitch?
(b) Why do we need two ears?
(c) Why can't we hear the sound made by bats?
(d) When a bee flies, we hear the sound produced by its wings. Why can't we hear a crow flapping its wings as it flies?
(e) How can you raise the pitch of the note of a veena string without changing its length?
(f) The harder you beat a drum, the louder is the sound produced? Explain why this is so.
(g) Why are the walls and ceiling of a cinema hall covered with sound-absorbing material?

Q. Why we can hear the sound produced by bees but we cant hear the sound of vibrations of pendulum?

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