As nouns the difference between wavelength and hertz

is that wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next; it is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency while hertz is in the International System of Units, the derived unit of frequency; one (period or cycle of any periodic event) per second. Symbol: Hz.