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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound1 Mark
MCQ
When sound travels through air, the air particles:
  • ✓
    Vibrate along direction of wave propagation
  • B
    Vibrate but not in any fixed direction
  • C
    Vibrate perpendicular to direction of wave propagation
  • D
    Do not vibrate
✓

Answer

Correct option: A.
Vibrate along direction of wave propagation
Air have bulk property so it only transfers longitudinal wave. A sound wave in air propagates as a longitudinal wave, in the form of compression and rarefaction so medium particles vibrate in the direction of wave propagation.

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