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A 140-keV photon strikes an electron and scatters through an angle of 120° from its original direction.(melectron = 9.11 × 10-31 kg,c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)
(a)What is the wavelength of the photon before scattering?
(b)What is the photon wavelength after scattering?
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