Frequency
The number of [see page 9, complete] cycle per second in a wave.
Energy/Power
The amount of energy needed to penetrate the [see page 7, threshold-of-hearing] varies depending on the frequency.
The number of [see page 9, complete] cycle per second in a wave.
The amount of energy needed to penetrate the [see page 7, threshold-of-hearing] varies depending on the frequency.