CHEM 120 Lecture 3: CH3 The Quantum
Document Summary
Explains the manner in which electrons exist and behave in atoms. Number of waves that will pass a point in a given period of thim. Interact so that they add to make a larger wave (cid:862)i(cid:374) phase(cid:863) Interact so that they cancel each other (cid:862)out of phase(cid:863) Energy emitted and absorbed by atom is quantized. Atoms could absorb or emit electromagnetic energy only in certain discrete amounts. Smallest amount of energy is called a quantum. Energy or each quantum is proportional to its frequency. Light shining on a metal surface emits electrons. Light must have a certain minimum frequency to eject electrons. Increasing intensity of light does not change threshold frequency. Photon or quantum of light (e = h ) When a photon is at threshold frequency, h = ( = binding energy) When a photon is at higher frequency, ke = h - . A(cid:373)ou(cid:374)t of e(cid:374)e(cid:396)gy i(cid:374) ato(cid:373) (cid:449)as (cid:396)elated (cid:396)elated to the ele(cid:272)t(cid:396)o(cid:374)"s positio(cid:374) i(cid:374) the ato(cid:373)
