In a plane progressive wave given by $y = 25\cos (2\pi t - \pi x)$, the amplitude and frequency are respectively
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(b) Comparing the given equation with $y = a\cos (\omega t - kx)$
$a = 25,$ $\omega = 2\pi n = 2\pi $==> $n = 1Hz$
$a = 25,$ $\omega = 2\pi n = 2\pi $==> $n = 1Hz$
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