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?

Assessment: JAMB UTME - Physics - 1991 Subject: Physics

Question 1 Report

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?
Answer Details
v =  λ F

260 x 1.29 =335.4ms-1

Echo time =  2 2  = 1sec.

distance = v x t

= 335.4 x 1 = 335.4m

Read lesson note on Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum (WAEC)
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