In the bell jar experiment, as air is removed from the jar: - Vidyadip

MCQ

In the bell jar experiment, as air is removed from the jar:

✓
Intensity of sound falls
B
Speed of sound falls
C
Intensity of sound increase
D
Speed of sound increases.

✓

Answer

Correct option: A.

Intensity of sound falls

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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