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 – 335.4m

Explanation

Recall V = F × λ
= 260 × 1.29

= 335.4ms−¹

Echo time = 2/2 = 1 sec

Distance = v x t = 335.4 x 1

= 335.4m