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

1. 1000 π Hz
2. 2000 Hz
3. 20 Hz
4. 1000 Hz

Correct answer: 1000 Hz

Solution

The angular frequency ω is given as 2000 rad/s. The frequency f is related to ω by the formula f = ω / (2π). Substituting ω = 2000, we get f = 2000 / (2π) = 1000 Hz.

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