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A progressive wave of frequency $50 \mathrm{~Hz}$ is travelling with velocity $350 \mathrm{~m} / \mathrm{s}$ through a medium. The change in phase at a given time interval of $0 \cdot 01 \mathrm{~s}$ is
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$\pi$ rad
$\lambda=\frac{350}{50}=7 m$
$x=\text { velocity } \times \text { time }=350 \times 0.01=3.5 m$
Phase change $\frac{2 \pi x}{\lambda}=\frac{2 \pi}{7} \times 3.5=\pi$ radian
$x=\text { velocity } \times \text { time }=350 \times 0.01=3.5 m$
Phase change $\frac{2 \pi x}{\lambda}=\frac{2 \pi}{7} \times 3.5=\pi$ radian
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