1.7 Echo
(a) Echo is caused by the reflection of sound wave from a hard and rigid surface.
(b) Reflection of sound waves obey the laws of reflection of waves.
(c) Echo can only be detected if the distance between the sound source and the reflecting surface exceed 17 m.
(d) In using effect of echo to measure the depth of the sea, sonic pulses are emitted towards the seabed. The reflected sonic pulses are recorded. If total time taken = t
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