A) \[\frac{\pi }{2}\] rad
B) \[\frac{\pi }{4}red\]
C) \[\pi \,red\]
D) \[\frac{\pi }{6}\,red\]
Correct Answer: C
Solution :
In the case of travelling wave, the reflection at a rigid boundary will take place with a phase change of\[\frac{\pi }{2}\]rad.
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