Quantity	High State	Low State
	X-rays	radio waves
E(nergy), E	high	low
F(requency), f	high	low
W(avelength), w	short	long
C(olor)	blue	red

Energy and frequency are proportional - when one increases, so does the other.

E f

Energy and wavelength are inversely related - higher energy means shorter wavelength.

E 1 / w

Redder colors are lower energy than bluer colors.