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3. (a) Explain TWO observed aspects of the photoelectric effect that violate classical physics, and bow these can be exp
Posted: Tue Apr 26, 2022 7:06 pm
by answerhappygod
- 3 A Explain Two Observed Aspects Of The Photoelectric Effect That Violate Classical Physics And Bow These Can Be Exp 1 (34.52 KiB) Viewed 33 times
3. (a) Explain TWO observed aspects of the photoelectric effect that violate classical physics, and bow these can be explained in terms of Einstein's "photon" theory. (4) (1) Consider a "classical electron in a hydrogen atom in an orbit of radius r. Assume that the velocity and the energy of the electron is given by: Απεραν and E= or Show how the idea of de Broglie waves and/or Bohr's quantisation, the can be used to explain the quantisation of the electron's energy. You should specifically derive the formulas: 2260 and Em = E/? (6) (c) Consider a particle in an infinitely deep one-dimensional potential well. Obtain the allowed energies and wave-functions for the particle. It is not necessary to normalize the wave-functions. (5) (d) The following equations relate to the tunnel effect E V2m(U - E) -2kL 1- 2167(1-5). -22 . Ti Briefly explain this effect. Make use of a diagram where necessary. Explain why this effect is not observed for macroscopic objects. (5)