P29_027 - 27. (a) If v is the speed of the positron then v...

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27. (a) If v is the speed of the positron then v sin φ is the component of its velocity in the plane that is perpendicular to the magnetic Feld. Here φ is the angle between the velocity and the Feld (89 ). Newton’s second law yields eBv sin φ = m e ( v sin φ ) 2 /r ,whe re r is the radius of the orbit. Thus r =( m e v/eB ) sin φ .Th epe r iodi sg iv enby T = 2 πr v sin φ = 2 πm e eB = 2 π (9 . 11 × 10 31 kg) (1 . 60 × 10 19 C)(0 . 10 T) =3 . 6 × 10 10 s
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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