The frequency of sinusoidal wave n = 0.40 cos [2000 t +

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

1. 1000 π Hz
2. 2000 Hz
3. 20 Hz
4. (1000/π) Hz

Correct Option: D

Comparing with the equation
ξ = A cos(2πcl + φ)

We get 2πν = 2000 v =	2000	=	1000	Hz
	2π		π