P22_040 - 40. We are concerned with the charges in the...

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40. We are concerned with the charges in the nucleus (not the “orbiting” electrons, if there are any). The nucleus of Helium has 2 protons and that of Thorium has 90. (a) Eq. 22-1 gives F = k q 2 r 2 = ³ 8 . 99 × 10 9 N · m 2 C 2 ´ ( 2(1 . 60 × 10 19 C) )( 90(1 . 60 × 10 19 C) ) (9 . 0 × 10 15 m) 2 =5 . 1 × 10 2 N . (b) Estimating the helium nucleus mass as that of 4 protons (actually, that of 2 protons and 2 neutrons,
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