MPSC Rajyaseva 2020 GS Paper 1 — Question 52
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जेव्हा एखाद्या ध्वनी तरंगाचे संपीड़न दृढ भंतीवर आदळेल तेव्हा त्याचे प्रतिबिंबित रूप हे : When a compression of sound waves is incident on rigid wall, it is reflected as :
At a rigid boundary, particle displacement has a node and pressure has an antinode -- the opposite of what happens at a free/open boundary. This means a pressure compression reflects back as a compression (not a rarefaction), with no phase change in the pressure wave. (The displacement wave does invert by 180 degrees, but the question is about the compression/pressure wave itself.)
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