A man hears his echo from a nearby hill 2s after he shouted. If the...
PHYSICS
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
Correct Answer: B. 335.4m
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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