Quiz-2-solutions

Quiz-2-solutions - Quiz#2 Topic 2(Experiments...

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Quiz #2: Topic 2 (Experiments) February 13, 2008 Name: _Solutions Problem 1 Electrons are accelerated across a potential of 12 V and enter a region of uniform magnetic field B = 8 Tesla perpendicular to the beam direction. Sketch the trajectory of the electrons for a B field going in the page. Find the velocity of electrons and the radius of curvature R of the electron beam in magnetic field. 2 2 2 2 2 = = = c v mc mv qV E K 2 2 mc qV c v = and qB mv R = , where q – charge, c = 3 × 10 8 m/s 86 26 21 1 2 2 4 3 10 / 2.06 10 / 0.511 10 eV e V vc m s m s mc eV ×× == × = × × () ( ) 31 6 6 19 9.1 10 2.06 10 / 1.46 10 1.46 1.6 10 8 kg m s Rm m CT μ × = ×⋅ Note about the units: e is cancelled, and T=V s/m 2 Problem 2. A solid metal ball glows so that the spectral distribution of its radiation has the maximum at 2.0 μ m. The temperature is then changed so that the total power radiated by the ball is 3 times higher than its
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This note was uploaded on 04/22/2008 for the course PHYS 320 taught by Professor Baski during the Spring '04 term at VCU.

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