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HW14-solutions

# HW14-solutions - Munoz(gm7794 HW14 TSOI(92515 This...

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Munoz (gm7794) – HW14 – TSOI – (92515) 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 oF 2) 10.0 points Consider nuclear fssion For which the reac- tion 235 92 U+ 1 0 n 138 56 Ba + 95 36 Kr + neutrons + energy is a good example. How many Free neutrons are in the products oF this reaction? 1. 3 correct 2. 5 3. 4 4. 6 5. 2 Explanation: In such nuclear reactions, the total baryon number (the sum oF the protons and the neu- trons) is conserved, as is the total charge. (235 - 92)+1 = 144 is the neutron number beFore the reaction. In the product, Ba and Kr have a total neutron number oF (138 - 56) + (95 - 36) = 141, so the total number oF Free neutrons in the product is 144 - 141 = 3. 002 (part 2 oF 2) 10.0 points Which statement is always true For neutron- induced fssion reactions involving 235 92 U? I. The end products always include Ba and Kr. II. The rest mass oF the end products is less than that oF 235 92 U+ 1 0 n . III. The total number oF nucleons (protons plus neutrons) in the end products is less than that in 235 92 U+ 1 0 n . 1. IandIIIonly 2. I, II, and III 3. IandIIon ly 4. II only correct 5. III only Explanation: The kinetic energy oF the initial (thermal) neutron is negligible. Nuclear reactions have many channels (diF- Ferent products), so statement I is False. The nucleon number is conserved, so state- ment III is False. Because oF conservation oF energy and the Fact that the end products carry kinetic en- ergy and/or additional energy in terms oF β rays (electrons, etc .) and γ rays (photons), the rest energy oF the product must be less

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HW14-solutions - Munoz(gm7794 HW14 TSOI(92515 This...

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