A fundamental constant in quantum mechanics that relates the energy of a photon to its frequency. It is approximately 6.626 x 10^-34 joule-seconds.
Planck's Constant (h) cheat sheet for homework
A branch of physics that deals with phenomena at very small scales where particles behave both as particles and waves.
A particle representing a quantum of light or other electromagnetic radiation.
Energy Level: A specific allowed energy value for an electron in an atom or molecule.