Question

A stone is dropped into a well in which the level of water is h, below the top of the well. If v is velocity of sound, then time T after which the splash is heard is equal to

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Answer 1

Explanation:

Time taken for the sound to reach to the top = Time taken for the stone to reach the ground + Time taken for the sound to reach the top.

h=ut+

2

1

at

2

(u is zero since the stone is freely falling)

h=

2

1

at

2

t

g

=

g

2h

Time taken for the sound to reach the top is

t

c

=

v

h

Total time taken =

g

2h

+

v

h