Heena Sharma, Shubhankat Vats and, Rashmi Gupta Solutions for Chapter: Sound, Exercise 3: Check Point 03

In an experiment on studying the laws of reflection of sound, if the incident wave makes an angle of ${35}^{\mathrm{o}}$ with the rigid surface (wall), what will be the angle of reflection?

What should be the minimum distance of the obstacle from the source of sound for hearing distance echoes?

An echo is returned in $6 \mathrm{s}$. What is the distance of reflecting surface form source? [given that speed of sound is $342 \mathrm{m} {\mathrm{s}}^{-1}$.

Write the name of sound absorbent materials used in concert hall.

Give two uses of multiple reflection of sound.