Q63 of 199 Page 208

What is an echo? How is echo formed?

The repetition of sound wave caused by the reflection of sound wave is called echo. For an echo to happen it requires a hard surface like a tall brick wall or clif to bounce the sound back.


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62

Name any two objects which are good reflectors of sound.

 62

State the laws of reflection of sound.

 63

What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C)?

 63

A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo? Speed of sound in air is 33 m/s.