- A periodic vibration whose frequency is audible to the average human.
- The SI unit for frequency is hertz (Hz).
- Generally the accepted standard range of audible frequency is 20 to 20,000 Hz.
- The range of frequencies individual hear is greatly influenced by environmental factors.
- Frequency below 20 Hz are called infra-sonic frequencies and above 20,000 Hz are called ultra-sonic frequencies.
- Sometimes young people can sense frequency above 20,000 Hz.
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