Waves on String: String with Mass MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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String with MassHardQuestion 31353

Question

String of length L has mass m attached at centre. Effective wave problem: the central mass causes:

A
No effect on standing waves
B
Reflection of waves at centre (partial node possible)
Correct
C
Complete absorption of waves
D
Doubling of frequency

Correct answer

Reflection of waves at centre (partial node possible)

Explanation

A mass on a string acts like an impedance discontinuity. It partially reflects and partially transmits waves, creating complex standing wave patterns with a partial node at the mass position.

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