1225_Physics ProblemsTechnical Physics

1225_Physics ProblemsTechnical Physics - 566 Molecules and...

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566 Molecules and Solids (b) The fourth term consists of 6 Na + at distance rr = 2 0 . Thus, to four terms, U ke r r ee =− + = 213 3 0866 2 0 2 0 .. a f . So we see that the electrostatic potential energy is not even attractive to 4 terms, and that the infinite series does not converge rapidly when groups of atoms corresponding to nearest neighbors, next-nearest neighbors, etc. are added together. ANSWERS TO EVEN PROBLEMS P43.2 4.3 eV P43.30 2% P43.4 (a) 1.28 eV; (b) σ = 0272 . n m , ∈= 465 e V ; P43.32 340 10 17 . × electrons (c) 6.55 nN; (d) 576 N m P43.34 see the solution P43.6 (a) 40 0 . eV µ , 9.66 GHz; P43.36 (a) 275 THz; (b) 1 09 . m (b) If r is 10% too small, f is 20% too large. P43.8 146 10 46 . ×⋅ kg m 2 P43.38 1.91 eV P43.40 226 nm P43.10 (a) 1 81 10 45 . kg m 2 ; (b) 1.62 cm P43.42 (a) 59.5 mV; (b) –59.5 mV
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