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Physics 250. Practice Exam II. 1. In a Compton scattering event, ... Electrons and holes can form a “hydrogenic atom” called an exciton. In Germanium,.
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Sun
Earth (^) Jupiter
m 2
W = 1400 W ⁄ m^2 R (^) E =1.5 × 1011 m r (^) E = 2 400, km r (^) J = 71 400, km
R (^) J = 5.2 R (^) E =7.8 × 1011 m
additon, there are excitations, called holes that behave exactly as if they were positively charged electrons with effective mass. In addition semi-conductors have a large dielectric
constant , so the Coulomb force between the electron and the hole is. Electrons and holes can form a “hydrogenic atom” called an exciton. In Germanium, , , and. Calculate the ground state energy and wavelength of the first Balmer line of an exciton in Germanium.
m (^) h^ *
κ ke 2 κ r 2
m (^) e^ *^ = 0.082 m (^) e m (^) h^ *^ = 0.042 m (^) e κ = 16.
M = 3.72Gev/ c^2 K = 1.2 × 10 – 3 eV
