wavelength
Used in physics and engineering for the wavelength of light, sound, radio waves, etc. Also used metaphorically for compatibility or being on the same wavelength.
The wavelength of this laser is 532 nanometers.
I just can't seem to get on the same wavelength with him.
We conducted an experiment to measure the wavelength of light.
Ultraviolet light has a short wavelength.
We adjust the laser's wavelength to run the experiment.
He and I are on a similar wavelength, so it's easy to talk to him.
Compton wavelength