The change in phase, if a wave is reflected at a less \( \mathrm{P}...

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The change in phase, if a wave is reflected at a less
\( \mathrm{P} \) dense surface, is

W
(1) Zero
(2) \( \pi \) radian
(3) \( \frac{\pi}{2} \) radian
(4) \( \frac{2 \pi}{3} \) radian
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