Topic 1 The Photoelectric Effect

Describe the photoelectric effect and explain qualitatively how Einstein it in terms of photons having an energy of hf.

Topic 2 de Broglie Waves

(a) Show that the momentum of a photon is related to its wavelength according to
 

(b) Describe qualitatively how de Broglie concluded that matter has a wavelength.

Topic 3 Uncertainty Principle

State Heisenberg's uncertainty principle.

Examples

What is the energy of a photon having a wavelength of 500 nm? [ 4.0 x 10^-19 J = 2.5 eV ]

What is the wavelength of an electron in a color television set as it strikes the screen after being accelerated by a 10 kV flyback transformer? [ 120 pm ]

Textbook Problems