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Sound — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceSound1 Mark
Question
In the bell jar experiment, as air is removed from the jar:
✓

Answer

  1. Intensity of sound falls
Explanation:
Sound is a mechanical wave and needs a material medium like air, water, steel, etc. for its propagation. As the air is pumped out of the sealed bell jar, the sound from the bell jar fades, because the medium is being removed, thus the intensity of sound decreases. 

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