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Sound is a wave motion generated by the vibrations of matter molecules. Frequency is the number of sound waves generated in 1 second. As the number of waves increases, the frequency increases and the audio gets thinner, and while it decreases, the frequency decreases and the audio becomes thicker. Frequency measurement unit is Hz - Hertz.

Amplitude is half of the distance between the peak point and trough point of the sound wave. The more the amplitude increases, the more the density of the sound wave gets. 

Human hearing range is stated to be between 20 Hz to 20 kHz.