A man hears his echo from a nearby hill 2s after he shouted. If the...

JAMB 1991

A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260Hz and the wavelength is 1.29m, how far away is the hill?

A. 330.0m
B. 335.4m
C. 660.0m
D. 670.8m

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Correct Answer: Option B

Explanation

v = \(\lambda\)F

260 x 1.29 =335.4ms^-1

Echo time = \(\frac{2}{2}\) = 1sec.

distance = v x t

= 335.4 x 1 = 335.4m

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A man hears his echo from a nearby hill 2s after he shouted. If the...

Correct Answer: Option B

Explanation

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