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–2 and speed of sound = 340 m s–1
NCERT Class IX
Sciences - Main Course Book
Chapter 12. Sound
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h = 500 m g = 10 m/sec/sec c = 340 m/sec
Time for the stone to travel to the base of the tower:
s = u t + 1/2 a t^2
500 = 0 + 1/2 * 10 * t^2
t = 10 sec.
Let us say the time for the splash to be generated is very less.
Time taken by the sound wave to travel to the top of the tower
= 500 m / 340 m/s
= 1.47 seconds
Total time after which the sound is heard at the top = 11.47 sec
Time for the stone to travel to the base of the tower:
s = u t + 1/2 a t^2
500 = 0 + 1/2 * 10 * t^2
t = 10 sec.
Let us say the time for the splash to be generated is very less.
Time taken by the sound wave to travel to the top of the tower
= 500 m / 340 m/s
= 1.47 seconds
Total time after which the sound is heard at the top = 11.47 sec
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