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: 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