A. Quantum Theory

1) electrons can only absorb or emit energy in discrete amounts called quanta (packets)

2) Energy of each quanta (photon) is proportional to frequency of radiation

Energy of a Quanta

June 2004 #40

Max Planck

h = Planck's constant  =6.63 X 10-34 Js

Since: c = fλ

c = 3 x 10⁸ m/s

And f = c/λ

Einstein, Photoelectric Effect