P27_041 - 41. (a) The charge q that ows past any cross...

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41. (a) The charge q that flows past any cross section of the beam in time ∆ t is given by q = i t ,andthe number of electrons is N = q/e =( i/e )∆ t . This is the number of electrons that are accelerated. Thus N = (0 . 50 A)(0 . 10 × 10 6 s) 1 . 60 × 10 19 C =3 . 1 × 10 11 . (b) Over a long time t the total charge is Q = nqt ,where n is the number of pulses per unit time and q is the charge in one pulse. The average current is given by i avg = Q/t = nq .N ow q = i t = (0 . 50 A)(0 . 10 × 10 6 s) = 5 . 0 × 10 8 C, so i avg =(500 / s)(5 . 0 × 10 8 C) = 2 . 5 × 10
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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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