A man standing 510m away from a wall sounds a whistle. Th...
A man standing 510m away from a wall sounds a whistle. The echo from the wall reaches him 3s later. Calculate the velocity of sound in air.
170 ms-1
340 ms-1
680 ms-1
765 ms-1
1530 ms-1
Correct answer is B
No explanation has been provided for this answer.
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