A man stands in front of a tall wall and produces a sound. If he receives the echo of the sound two seconds later, calculate his distance from the wall. (The speed of sound in air is 330ms-1)

A man stands in front of a tall wall and produces a sound. If he receives the echo of the sound two seconds later, calculate his distance from the wall. (The speed of sound in air is 330ms^-1)

A 600m
B 400m
C 330m
D 328m
E 165m

waec 1993 physics

The correct answer is C. 330m

x = vt/2 = \(\frac {330 \times 2} {2}\) = 660/2 = 330m

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