NEET Physics Transverse & Longitudinal Waves MCQ Question
What happens to a wave pulse when it reflects off a rigid boundary?
It undergoes a phase change of π.
It maintains the same phase and amplitude.
It disappears completely.
It changes frequency.
Correct Answer
Detailed Explanation
When a wave pulse reflects off a rigid boundary, it suffers a phase change of π (180 degrees) due to the boundary condition that requires zero displacement at the boundary. This is explained by the principle of superposition, which states that the reflected and incident waves must differ by this phase change for the resultant displacement to be zero.
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