A man hears his echo from a nearby hill 2s afte... - JAMB Physics 1991 Question
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 option: b
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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