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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound1 Mark
MCQ
Which is the quantity determines the loudness of a sound wave?
  • A
    Wavelength
  • B
    Frequency
  • ✓
    Amplitude.
  • D
    Wave velocity.
✓

Answer

Correct option: C.
Amplitude.
The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. A sound is louder as the amplitude of vibration is greater, and the intensity decreases as the distance from the source increases. Loudness is measured in units called decibels.

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