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The frequency of the sinusoidal wave `y=0.40 cos [2000 t +0.80 x]` would be

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The frequency of the sinusoidal wave
`y=0.40 cos [2000 t +0.80 x]` would be
A. `1000 pi Hz`
B. `2000 Hz`
C. `20 Hz`
D. `(1000)/(pi)Hz`
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Correct Answer - D
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