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1180_Physics ProblemsTechnical Physics

1180_Physics ProblemsTechnical Physics - Chapter 42 ga f...

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Chapter 42 521 P42.7 (a) r 2 2 2 0 052 9 2 0 212 = = . . nm nm b ga f (b) m v m k e r e e e 2 2 2 31 9 19 2 9 9 11 10 8 99 10 1 60 10 0 212 10 = = × × × × . . . . kg N m C C m 2 2 e je je j m v e 2 25 9 95 10 = × . kg m s (c) L m v r e 2 2 2 25 9 34 9 95 10 0 212 10 2 11 10 = = × × = × . . . kg m s m kg m s 2 e je j (d) K m v m v m e e e 2 2 2 2 2 25 2 31 19 1 2 2 9 95 10 2 9 11 10 5 43 10 3 40 = = = × × = × = b g e j e j . . . . kg m s kg J eV (e) U k e r e 2 2 2 9 19 2 9 18 8 99 10 1 60 10 0 212 10 1 09 10 6 80 = − = − × × × = − × = . . . . . N m C C m J eV 2 2 e je j (f) E K U 2 2 2 3 40 6 80 3 40 = + = = . . . eV eV eV P42.8 We use E n n = 13 6 2 . eV . To ionize the atom when the electron is in the n th level, it is necessary to add an amount of energy given by E E n n = − = 13 6 2 . eV . (a) Thus, in the ground state where
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