two buldings are 3.3km apart .gun is fired from 1 bulding .the time difference between seeing the flash and its sound is 10sec find the speed of sound in air.

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Solution

Time taken by the light to travel from one building to other building is,
Speed = Distance / Time
Speed of light = 3 x 10⁸ m/s
Time = Distance / Time = 3300 m / 3 x 10⁸ m/s = 11 x 10 ^-6 sec
Time taken by the sound to travel from one building to other building is equal to,
= 11 x 10 ^-6 sec + 10 sec = 0.000011 + 10 = 10.000011 sec
Speed of sound = Distance / time = 3300 m / 10.000011 sec = 329.9 m/s

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