>>Red light has relatively long waves, around 700 nm long
Those 700 nm or ~428274 gigahertz is the frequency of red (as a human eye normally sees color) light waves.
https://scied.ucar.edu/learning-zone/atmosphere/visible-ligh...
https://www.translatorscafe.com/unit-converter/en/frequency-...
>>Frequency is the number of occurrences of a repeating event per unit of time
https://en.wikipedia.org/wiki/Frequency
You can scroll down and you will find "Light" and "Sound"
But maybe you don't know how a rainbow works, this is "our" visible spectrum, to the left increased frequency to the right increased wavelength:
https://en.wikipedia.org/wiki/Frequency#/media/File:EM_spect...
>the concept of "waves" and come to the conclusion that these are waves you are looking at.
It's not a concept but:
>>a wave is a disturbance or variation which travels through a medium.
https://www.acs.psu.edu/drussell/demos/waves-intro/waves-int...
And stop with you wannabe philosophical BS, it sounds just uneducated even borderline clownish.
So, yes, waves are an abstraction, how can you not see it? When you look at the sea you don't see waves, you see colors moving around and then when you try to describe what you see, you define the concept of "waves" and come to the conclusion that these are waves you are looking at. But that happens entirely inside your mind. Waves is a concept like frequency.