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We drop a stone into a deep borehole. We hear the down arriving stone's knocking 7,7 seconds after the dropping. (The voice's velocity is 340 m/s) How deep is the borehole?

Nov 18th, 2014

distance = speed x time

distance = depth of the borehole
speed = speed of sound = 340m/s
time = 7.7 sec

therefore, depth of borehole = 340x7.7 meters = 2618 meters.

there you go.
Regards,
Ravi

Nov 18th, 2014

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