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Sound — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceSound1 Mark
Question
A musical instrument is producing a continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through:
  1. Water.
  2. Wax.
  3. Vacuum.
  4. Empty vessel.
✓

Answer

  1. Vacuum.
Explanation:
Sound waves cannot propagate through vacuum.

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