Reflection of Sound

Which property of sound is made use of in designing sound proof chambers?

The minimum distance between the source of sound and the obstacle for one to be able to hear an echo is _____$\left(17.2/15.3\right)$ meters.

The persistence of sound due to its multiple reflections is called _____(reverberation/timbre).

Repetition of sound due to its reflection is called _____.

State and derive a condition for echo to be heard.  Explain how bats catch their prey.

State the laws of reflection of sound. Draw diagram of experimental set up used to verify them.

Define echo. An echo is heard after $3 \mathrm{s}$. Find the distance of reflecting surface from the source given that speed of sound is $342$ $\mathrm{m}/\mathrm{s}$.

Give reasons : Ceiling of concert halls are made curved.

What is reverberation?

Echo cannot be heard in a small room. Why?

An echo is returned in $3$ s. What is the distance of reflecting surface from the source given that the speed of sound is $342 {\mathrm{ms}}^{-1}$?

Why are ceiling of concert halls and conference halls made curved? Explain by giving a diagram.

Give a reason for the following:
Ceilings of concert halls are curved.

Why are the roof and walls of an auditorium/hall generally covered with sound absorbent materials?

What is reverberation? Suggest two methods to reduce it in big halls.

A person produced a sound with a siren near a cliff and heard an echo after six seconds. Find the distance of the siren from the cliff if the velocity of sound waves produced is $330 \mathrm{m} {\mathrm{s}}^{-1}$.

How is excessive reverberation reduced in an auditorium?

Aditi clapped her hands near a cliff and heard the echo after $4$ seconds. What is the distance of the cliff from her if the speed of sound is taken as $346 \mathrm{m} {\mathrm{s}}^{-1}$?

State two laws of reflection of sound.

Give two conditions for echo to be heard.