Weekly_004.SOLN - Phys 274 c Eric B Szarmes Weekly Homework...

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Phys 274 – c Eric B. Szarmes 14 February 2011 Weekly Homework 004 SOLUTIONS Problem 1 – Q5T.1, page 92. (a) When light goes through a slit, the beam broadens somewhat, and if it is projected on a screen, one can see brights and dark fringes on the slit image. A: Consistent with a pure wave model , since the primary effects of diffraction (broadening) and interference (fringes) are manifestations of waves, NOT particles. (b) When light shines on a metal surface, electrons are ejected from the surface. C: Consistent with either model , since both of those models have a mechanism for ejecting electrons (for the wave model, the electron oscillations induced by the electric field; for the particle model, the collisions with photons). (c) The number of electrons ejected from a metal surface depends directly on the intensity of the light shining on that metal surface. C: Consistent with either model . In the wave model, the energy deposited into the metal (which is capable of ejecting a proportional number electrons due to the shaking effect) increases directly with intensity, and in the particle model, the number of incident photons (which knock the electrons loose) is also proportional to the intensity.
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