p43_085

# p43_085 - e is set equal to its SI value 1 . 6 10 19 C. We...

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85. Kinetic energy (we use the classical formula since v is much less than c ) is converted into potential energy (see Eq. 25-43). From Appendix F or G, we ±nd Z = 3 for Lithium and Z = 90 for Thorium; the charges on those nuclei are therefore 3 e and 90 e , respectively. We manipulate the terms so that one of the factors of e cancels the “e” in the kinetic energy unit MeV, and the other factor of
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Unformatted text preview: e is set equal to its SI value 1 . 6 10 19 C. We note that k = 1 / 4 can be written as 8 . 99 10 9 V m / C. Thus, from energy conservation, we have K = U = r = kq 1 q 2 K = ( 8 . 99 10 9 V m C ) ( 3 1 . 6 10 19 C ) (90 e ) 3 . 00 10 6 eV which yields r = 1 . 3 10 13 m (or about 130 fm)....
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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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