Sound Waves and Hearing

Front

Ultrasonic

Back

Sound waves with a frequency too high to be heard by the normal human ear (above 20,000 hertz).

Front

Infrasonic

Back

Sound waves with a frequency too low to be heard by the normal human ear (below 20 hertz).

Front

Decibel

Back

A unit used to measure the intensity of a sound or the power level of an electrical signal.

Front

Pinna

Back

The part of the ear that collects sound waves.

Front

Hertz

Back

A unit of time to measure frequency.