Frequency of a sound wave is measured in
APascal (Pa) only
BNewton (N) only
CJoule (J) only
DHertz (Hz)
Answer & Solution
Correct answer: D. Hertz (Hz)
1. Frequency is the number of vibrations per second.
2. 1 vibration per second = 1 hertz.
3. Newton is force, joule is energy, pascal is pressure.
4. So the unit of frequency is hertz.
_Source: Selina Concise Physics Class 9, Ch 8 Sound (Mistral OCR'd PDF), section on terms of wave_
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