
Yes, it's the apparent change
in the frequency of a WAVE...
The Big Bang Theory Season 1, Episode 6

If you look at Huygens, light is a WAVE,
as confirmed by the double-slit experiments.
The Big Bang Theory Season 1, Episode 1

The motion of the WAVE
through the structure.
The Big Bang Theory Season 3, Episode 14

when the WAVE function collapses?
The Big Bang Theory Season 10, Episode 19

♪ Club hoppers everywhere
Wave like you just do not care ♪♪
Breaking Bad Season 4, Episode 2