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Question 31384
JEE Physics · Hard

Waves on String: Energy Transport MCQ

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

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Energy TransportHardQuestion 31384

Question

Wave packet (pulse) travels on string. If string has some internal friction, the pulse:
  1. A
    Speeds up
  2. B
    Slows down and its amplitude decreases
    Correct
  3. C
    Amplitude increases, speed unchanged
  4. D
    Frequency changes only

Correct answer

Slows down and its amplitude decreases

Explanation

Internal friction (viscoelastic damping) converts wave energy to heat. Amplitude decreases exponentially. For most real strings, speed change is small but attenuation is observable.

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