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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound1 Mark
MCQ
Which of the following cannot travel through vacuum$?$
  • A
    Light waves
  • B
    Heat waves
  • C
    $X-$rays
  • ✓
    Sound waves
✓

Answer

Correct option: D.
Sound waves

Light waves, heat waves, $X-$rays are examples of electromagnetic waves, which do not require any medium for their propagation.
Sound waves cannot travel through a vacuum. It needs a material medium for its propagation. Sound waves can propagate only when the vibrational energy of the particles of the medium is travelling from one point to another.

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