How far from a cliff should a boy stand in orde... - WAEC Physics 1992 Question
How far from a cliff should a boy stand in order to hear the echo of his clap 0.9s later? (Speed of sound in air = 330 ms-1)
A
36.67m
B
74.25m
C
148.50m
D
297.00
correct option: c
v = 2x/t ∴ distance x = vt/2 = 148.5m
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