39. (a) From Eq. 38-11, (1 cos )ehmcθ∆λ =−. In this case φ= 180° (so cos = –1), and the change in wavelength for the photon is given by ∆λ= 2h/mec. The energy E'of the scattered photon (with initial energy E = hc/λ) is then EhcEEhmcEhcEEmcee'/(/)(/)/.(.
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