The equation of $S.H.M.$ is $y = a\sin (2\pi nt + \alpha )$, then its phase at time $t$ is
A$2\pi nt$
B$\alpha $
C$2\pi nt + \alpha $
D$2\pi t$
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C$2\pi nt + \alpha $
c (c) $y = a\sin (2\pi nt + \alpha )$. Its phase at time $t = 2\pi nt + \alpha $
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