Question

what is frequency and sound​

Answer 1

The frequency of a wave is the number of waves that pass by each second, and is measured in Hertz (Hz). For example, a sound wave might have a frequency of 450 Hz.

sound is the vibrations that travel through the air or another medium and can be heard when they reach a person's or animal's ear.

Answer 2

frequency is defined as the number of vibrations per second

sound is produced by a vibrating body.

sound wave is a mechanical and a longitude wave which is composed of compressions and rarefractions