In a case of travelling wave, reflection at a rigid boundary will take place with a phase change....

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In a case of travelling wave, reflection at a rigid
\( \mathrm{P} \)
boundary will take place with a phase change of
W
(1) \( \frac{\pi}{2} \) radian
(2) \( \frac{\pi}{4} \) radian
(3) \( \frac{\pi}{6} \) radian
(4) \( \pi \) radian


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