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Unit - 7.1 Characteristics Of Sound — PHYSICS STD 8 — Question

ICSE BoardEnglish MediumSTD 8PHYSICSUnit - 7.1 Characteristics Of Sound1 Mark
MCQ
The frequency of ultrasonic waves is :
  • A
    less than 20 Hz
  • B
    between 20 and 10,000 Hz
  • C
    between 20 and 20,000 Hz
  • ✓
    above 20,000 Hz
✓

Answer

Correct option: D.
above 20,000 Hz
D

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