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Unit - 6.2 Reflection and Characteristics of Sound — PHYSICS STD 7 — Question

ICSE BoardEnglish MediumSTD 7PHYSICSUnit - 6.2 Reflection and Characteristics of Sound1 Mark
MCQ
The frequency of infrasonic waves is :
  • ✓
    less than 20 Hz
  • B
    between 20 and 10,000 Hz
  • C
    between 20 and 20,000 Hz
  • D
    above 20,000 Hz
✓

Answer

Correct option: A.
less than 20 Hz
A

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