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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound1 Mark
MCQ
A vibrating body:
  • A
    Will always produce sound
  • B
    May or may not produce sound if the amplitude of vibration is low
  • C
    Will produce sound which depends upon frequency
  • D
    None of the above
✓

Answer

  1. Will produce sound which depends upon frequency

Explanation:

A vibrating body vibrates the surrounding air, and when these vibrations reach our ears we hear sound. But, some vibrations cannot be perceived as sound to humans as human ears can only detect sound in the frequency range of 20Hz to 20,000Hz, so depending upon the vibration frequency, can only we define a vibration as sound.

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