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14. waves and sound — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
Two identical harmonic pulses travelling in opposite directions in a taut string approach each other. At the instant when they completely overlap, the total energy of the string will be
  • A
    zero
  • B
    partly kinetic and partly potential
  • ✓
    purely kinetic
  • D
    purely potential
✓

Answer

Correct option: C.
purely kinetic
c
When they overlap, they form stationary waves, as they cancel each other because of the opposite direction and equal magnitude.

Hence the displacement of the string becomes zero, resulting in zero potential energy and purely kinetic energy.

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