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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound1 Mark
MCQ
Sound corresponding to which frequency is ultrasonic sound?
  • A
    $30Hz$
  • B
    $300Hz$
  • C
    $3000Hz$
  • ✓
    $30,000Hz$
✓

Answer

Correct option: D.
$30,000Hz$

$30,000Hz$
Sound having a frequency of more than $20000Hz$ in known as ultrasonic. It can not heard by us.

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