962_Physics ProblemsTechnical Physics

962_Physics ProblemsTechnical Physics - Chapter 34 P34.35...

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Chapter 34 303 P34.35 (a) Constructive interference occurs when dn cos θλ = for some integer n . cos θ λλ λ == F H G I K J = n d nn 2 2 n =±± 012 ,,, ∴= = ° ° strong signal @ cos , 1 09 0 2 7 0 (b) Destructive interference occurs when d n cos = + F H G I K J 21 2 :c o s =+ n ± = ° ° weak signal @ cos , 1 101 8 0 af FIG. P34.35 P34.36 For the proton, Fm a = yields qvB mv R sin . 90 0 2 °= . The period of the proton’s circular motion is therefore: T R v m qB 2 2 π . The frequency of the proton’s motion is f T = 1 . The charge will radiate electromagnetic waves at this frequency, with == = c f cT mc qB 2 . *P34.37 (a) The magnetic field Bk =− 1 2 0 µω Jk x t max cos ± bg applies for x > 0, since it describes a wave moving in the ± i direction. The electric field direction must satisfy SE B 1 0 µ as ±±± ijk so the direction of the electric field is
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