Two waves of frequencies $20 Hz$ and $30 Hz.$ Travels out from a common point. The phase difference between them after $0.6 sec$ is
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(a) Beats period = $\frac{1}{{30 - 20}} = 0.1 sec$
$\Delta \phi = \frac{{2\pi }}{T}\Delta .t = \frac{{2\pi }}{{0.1}} \times 0.6 = 2\pi \times 6 = 12 \pi $ or Zero.
$\Delta \phi = \frac{{2\pi }}{T}\Delta .t = \frac{{2\pi }}{{0.1}} \times 0.6 = 2\pi \times 6 = 12 \pi $ or Zero.
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