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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound1 Mark
MCQ
In the bell jar experiment, as air is removed from the jar:
  • A
    Intensity of sound falls
  • B
    Speed of sound falls
  • C
    Intensity of sound increase
  • D
    Speed of sound increases.
✓

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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