question_answer 30)

A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Given, g = 10 m/s   and speed of sound is 340 m/s  .

Answer:

Here, height through which the stone falls, h = 500 m speed of sound, v = 340 m , g = 10 m If t is the time taken by the stone to fall through h, then   Further, if t' is the time taken by sound (produced as a result of splashing) to travel to the top of the tower,     Time after which the splash is heard at the top of the tower = t + t' = 10 s + 1.47 s = 11.47 s