2m
4m
1m
3m
Correct answer is C
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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