When a wave is reflected normally from a rigid boundary, the reflected wave suffers a phase chan...

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When a wave is reflected normally from a rigid boundary, the reflected wave suffers a phase change of (assuming no absorption)
(a) \( \pi / 2 \)
(b) \( \pi / 4 \)
(c) \( \pi \)
(d) \( 2 \pi \)
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