Q.13. 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,
and speed of sound = .
Given the height of the tower, ,
and the velocity of the sound, ,
Acceleration due to gravity,
Let the initial velocity of the stone, , as the stone is initially at rest.
Let the time taken by the stone to fall to the base of the tower be
Now, according to the IInd Equation of Motion:
Now, the time taken by the sound to reach the top from the base of the tower,
Therefore, the splash is heard at the top after time,