Quiz-2 Solns

Quiz-2 Solns - Quiz #2: Topic 2 (Experiments) Feb 14, 2007...

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Quiz #2: Topic 2 (Experiments) Feb 14, 2007 Name: _Solutions Problem 1 Electrons are accelerated across a potential of 25 V and enter a region of uniform magnetic field B = 5 Tesla perpendicular to the beam direction. Find the velocity of the electrons and the radius of curvature R of the positron beam in magnetic field. 2 2 mv qV E K = = m qV v 2 = , qB mv R = where q – charge, c = 3 × 10 8 m/s s m eV eV s m mc eV c v / 10 98 . 2 10 511 . 0 25 2 / 10 3 25 2 6 6 8 2 × = × × × = × = m m T C kg eV J eV R µ 37 . 3 10 37 . 3 5 10 6 . 1 ) 10 1 . 9 )( / 10 6 . 1 ( 25 2 6 19 31 19 = × = × × × × × × = or m m T C s m kg R 37 . 3 10 37 . 3 5 10 6 . 1 ) / 10 98 . 2 )( 10 1 . 9 ( 6 19 6 31 = × = × × × × = Note about the units: T = V s/m 2 = kg m 2 /(C s 2 ) Problem 2 An incandescent lamp with the emissivity of 88% has the maximum of its spectral distribution at 1.8 µ m. The temperature of the lamp’s filament is then changed so that the total power radiated by
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This homework help 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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