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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound1 Mark
MCQ
Which one has higher frequency$?$
  • A
    Infrasonic sound
  • ✓
    Ultrasonic sound
  • C
    Audible sound
  • D
    All of the above have same frequency
✓

Answer

Correct option: B.
Ultrasonic sound

Audible sound has a frequency range of $20\ Hz$ to $20\ kHz.$
Infrasonic frequency is below audible range, i.e. below $20\ Hz.$
Ultrasonic frequency is above audible range, i.e. above $20\ KHz.$

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