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(D) When a wave pulse traveling along a stretched string reaches a fixed end,the fixed end acts as a rigid boundary or a denser medium. According to t

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$A$ phase change of $180^o$ with velocity reversed

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(D) When a wave pulse traveling along a stretched string reaches a fixed end,the fixed end acts as a rigid boundary or a denser medium. According to the laws of reflection,when a wave is reflected from a fixed boundary,it undergoes a phase change of $\pi$ radians (or $180^o$). Since the wave is now traveling in the opposite direction,its velocity vector is also reversed. Therefore,the reflected pulse has a phase change of $180^o$ and its velocity is reversed.

$A$ pulse or a wave train travels along a stretched string and reaches the fixed end of the string. It will be reflected back with

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