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GCSE Physics · key term
The unit of frequency; one hertz means one complete cycle or oscillation per second.
Used by Edexcel
Specification 4.14P, 10.36 · Paper 1, Paper 2
Revise: Infrasound DefinitionFrequency is measured in hertz (Hz), so a frequency of 12 Hz means 12 complete oscillations every second.
The unit of frequency; 1 Hz means one complete cycle per second.
Use the strict boundary stated by Edexcel: infrasound has a frequency less than 20 Hz. A frequency of exactly 20 Hz is not less than 20 Hz.
Do not confuse frequency with amplitude. A sound is infrasound because its frequency is below 20 Hz, not because it is quiet.
Keep the quantities distinct: 50 Hz is the frequency, whereas about 230 V is the potential difference.
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