This is simply calculated at how many cycles (waves) occur every second. These cycles are repeated so really we only need to look at how many cycles (waves) occur in one second.
The result is measured as cycles/second and this unit of frequency is called a Hertz and the abbreviation is Hz.
Using the waves/arcs analogy above think of each wave as a cycle and the amount of waves that are dispersed in one second are calculated as frequency. You cannot get simpler than that…..how many cycles hit you in one second.
Heinrich Hertz was a clever chap who worked with wavelengths and frequency, so we have to thank the man and it seemed only right to name this little calculation after him. I always remember the rent-a–car agency when I think of frequencies and Hertz and it makes me smile every time so remembering that name is easy. This is my personal ‘tag’ for frequency.
To give you an example of how easy this is consider the following example:
If you had 50 cycles hit you in one second then that would be a 50 Hz wave.
So it also follows and makes complete sense that if you had 10,000 cycles per second then that would be 10,000 Hz, but, because we don’t want to have to write so many zeros every time a thousand appears we use the letter k to denote a thousand.
So, 10,000 Hz is now written as 10 kHz. There is a reason we do this and it’s not because we want to look deep and complicated individuals but simply because of all the work that has been carried out on our hearing range in the past. We even use the letter K to denote thousands when it comes to money.
‘What did you earn last year?’
‘10 K man.’
And a range was formed; sure it varies but generally speaking, our hearing range lies anywhere between 20 Hz (low), to 20 kHz (high).