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A mirror faces a cliff located some distance away. Mounted on the cliff is a second mirror,
directly opposite the first mirror and facing toward it. A gun is fired very close to the first mirror.
The speed of sound is 343 m/s. How many times does the flash of the gunshot travel the round-
trip distance between the mirrors before the echo of the gunshot is heard
Solution
lets assume that echo is heard after t time. distance covered:
by light = 3*10^8 * t
by sound = 343*t
So, number of trips = 3*10^8/343 = 8.75*10^5

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  • 1. A mirror faces a cliff located some distance away. Mounted on the cliff is a second mirror, directly opposite the first mirror and facing toward it. A gun is fired very close to the first mirror. The speed of sound is 343 m/s. How many times does the flash of the gunshot travel the round- trip distance between the mirrors before the echo of the gunshot is heard Solution lets assume that echo is heard after t time. distance covered: by light = 3*10^8 * t by sound = 343*t So, number of trips = 3*10^8/343 = 8.75*10^5