A. 2m
B. 4m
C. 1m
D. 3m
Correct Answer:
Option C = 1m
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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