Frequency measures cycles per second, in hertz (Hz). From power line hum (50–60 Hz) to processor clocks (GHz), frequency is fundamental.
The Hertz
1 Hz = 1 cycle/second. f = 1/T (period). Named after Heinrich Hertz, who proved electromagnetic waves exist.
Frequency Ranges
- Audio: 20 Hz – 20 kHz
- AM radio: 530 – 1,700 kHz
- FM radio: 88 – 108 MHz
- Wi-Fi: 2.4 GHz and 5 GHz
- CPU clock: 2–5 GHz
Conversions
- 1 MHz = 1,000 kHz
- 1 GHz = 1,000 MHz
- 1 THz = 1,000 GHz
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Frequently Asked Questions
What is the relationship between frequency and period?
Frequency = 1/period. A 100 Hz signal has a period of 0.01 seconds. Higher frequency means shorter period.