There are only a few properties of light.
Frequency (f) and wavelength ( ) are inversely proportional to one another - one goes up, the other goes down to keep their product constant.
There is an alternative description for E-M radiation in which the light energy is carried in Photons (like little bullets of light) that have associated energy, wavelength and frequency. We will use these descriptions interchangably.
It turns out that most of you are already familiar with a broad range of E-M waves.
``kilo'' ``1000''; ``hertz''