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HW4Ans - HaoLi Oct.2010 1 A 2 B ,whichdefineEM,,are

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MP 200 Radiation Physics Assignment 04 Solution Hao Li Oct. 2010. 1. A. 2. B. The grand unified theory refers to any of several similar models in particle physics that three gauge interactions in the standard model, which define EM, weak and strong interactions, are merged into one single interaction characterized by a larger gauge symmetry and one unified coupling constant rather than three independent ones. Therefore the answer is two. 3. B. 4. C. 5. C. 11 3 3 13 15 5.29 10 ( ) ( ) 8.6 10 1.2 10 nuclear atomic atomic nuclear r m r m ρ ρ × = = = × × 6. A. 7. C. 8. A. 9. A. 10. 1 2 3 1 1 2 2 ( ) (1.007825 2.014102 3.0160293) 931.5 5.494 H H He Q m m m c MeV MeV = + = + × = 11. 13 4 16 6 2 8 2 ( ) (13.003355 4.002603 15.994915 1.008665) 931.5 2.215 n C He O m m m m c MeV MeV + = + × = 12. The semi empirical equation: 3 2 2 2 3 5 4 2 1 2 1 3 1 ( 1) ( 2 ) [ ( ) ] 0 1 p n C Z Z C C A Z Mc Zm A Z m c C A C A A A A = + + + +
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