566 Molecules and Solids(b)The fourth term consists of 6 Na+at distance rr=20. Thus, to four terms,Uk erk eree= −+=2 1330 8662020..af.So we see that the electrostatic potential energy is not even attractive to 4 terms, and that theinfinite series does not converge rapidlywhen groups of atoms corresponding to nearestneighbors, next-nearest neighbors, etc. are added together.ANSWERS TO EVEN PROBLEMSP43.24.3 eVP43.302%P43.4(a) 1.28 eV; (b) σ=0 272.nm, ∈=4 65.eV ;P43.323 401017.×electrons(c) 6.55 nN; (d) 576 N mP43.34see the solutionP43.6(a) 40 0. eVµ, 9.66 GHz;P43.36(a) 275 THz; (b) 1 09.mµ(b) If ris 10% too small, fis 20% too large.P43.81 461046.×⋅−kg m2P43.381.91 eVP43.40226 nmP43.10(a) 1 811045.×⋅−kg m2; (b) 1.62 cmP43.42
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