The frequency of the sinusoidal wave $y = 0.40\cos [2000\,t + 0.80\,x]$ would be
AIPMT 1992, Easy
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(d) Compare the given equation with $y = a\cos (\omega t + k\phi )$
==> $\omega = 2\pi n = 2000$
==> $n = \frac{{1000}}{\pi }Hz$
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