A plane sound wave of frequency 85.5Hz and velocity 342ms-1 is reflected from a vertical...

JAMB 2001

A plane sound wave of frequency 85.5Hz and velocity 342ms^-1 is reflected from a vertical wall. At what distance from the wall does the wave have antinode?

A. 2m
B. 4m
C. 1m
D. 3m

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Correct Answer: Option C

Explanation

If F = 85.5Hz, V = 342ms^-1,
Then wavelength = V/F = 342/85.5 = 4m

Then if wavelength = 4m
=> wavelength/2 = 4/2 = 2m = NN,
Thus NA = wavelength/4 = 4/4 = 1m.

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