A) 1000 p Hz
B) 2000 Hz
C) 20 Hz
D) \[\frac{1000}{\pi }Hz\]
Correct Answer: D
Solution :
Compare the given equation with \[y=a\cos (\omega t+k\varphi )\] Þ \[\omega =2\pi n=2000\] Þ \[n=\frac{1000}{\pi }Hz\]
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