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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 $0.01 \mathrm{~s}$ is
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$\pi \mathrm{rad}$
We know, $\lambda \mathrm{f}=\mathrm{v}$
$\therefore \lambda=\frac{350}{50}=7 \mathrm{~m}$
Path difference $\mathrm{x}=$ Velocity $\times$ time $=350 \times 0.01=3.5 \mathrm{~m}$
Phase change $\frac{2 \pi x}{\lambda}=\frac{2 \pi}{7} \times 3.5=\pi$ radian
$\therefore \lambda=\frac{350}{50}=7 \mathrm{~m}$
Path difference $\mathrm{x}=$ Velocity $\times$ time $=350 \times 0.01=3.5 \mathrm{~m}$
Phase change $\frac{2 \pi x}{\lambda}=\frac{2 \pi}{7} \times 3.5=\pi$ radian
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