Question

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Answer 1

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1. the rate at which something occurs over a particular period of time or in a given sample is called as frequency

2. Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz

3. infrasonic sound --People use this frequency range for monitoring earthquakes and volcanoes, charting rock

ultrasonic sound--Ultrasound imaging or sonography is often used in medicine.

4. Sound waves with frequencies less than 20Hz are called infrasonic..

those with frequencies above 20kHz are called ultrasonic.

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Answer 2

Answers:

1.frequency describes the number of waves that pass a fixed place in a given amount of time..

2.Human can detect sounds in a frequency range from about 20Hz to 20kHz..