39.39: a) The first dark band is located by a θ λ sin = 355nm sin25.0 150nm sin λ = ° = = θ a b) Find λ for the electrons J 10 1.324 λ 18 photon-× = = hc E s m kg 10 1.553 2 so ) ( 24 ⋅ × = = =-mE p m 2 p E 2 m 10 4.266 λ 10-× = = p h No electrons at locations of minima in the diffraction pattern. The angular position of these
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