'Frequency' is a word that often confuses some people ... for no good reason. It just means "frequent-ness" or "often-ness" ... how often something happens.
The SI unit of frequency is the Hertz (Hz). Hz means 'per second'. So " 13 Hz " means 13 per second.
Here are examples of frequency:
-- 780 kilohertz (on your AM radio dial) -- 98.7 Megahertz (on your FM dial) -- 5.8 Gigahertz -- twice a day -- three per week -- every 6 months
<span>As a sound source gets closer, both the volume and the pitch of the sound increased. Then, as the sound source passed by you, both the volume and the pitch of the sound decreased. Hope this helps</span>
