ch42-p012 - 12(a The mass number A is the number of...

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12. (a) The mass number A is the number of nucleons in an atomic nucleus. Since mm pn the mass of the nucleus is approximately Am p . Also, the mass of the electrons is negligible since it is much less than that of the nucleus. So M Am p . (b) For 1 H, the approximate formula gives M Am p = (1)(1.007276 u) = 1.007276 u. The actual mass is (see Table 42-1) 1.007825 u. The percentage deviation committed is then δ = (1.007825 u – 1.007276 u)/1.007825 u = 0.054%
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This note was uploaded on 05/19/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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