Question

A pebble is dropped freely in a well from its top. It takes 20 s for the pebble to reach the water surface in the well. Calculate i) the depth of water surface and ii) the time when echo is heard after the pebble is dropped. ( g = 10 m/s^2 and speed of sound = 330 m/s)

Answer 1

Answer:

the depth of water surface is 2000m.

the time when echo is heard is 20 + 6.06 = 26.06s