Ch6 HW3 - Ch6 HW3

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Ch6 HW3 (Homework) BRANDON JARROTT FELDKAMP PHYS 2211, section M, Fall 2008 Instructor: Jennifer Curtis Web Assign Current Score: 18 out of 19 Due: Wednesday, October 22, 2008 09:00 AM EDT Description Review of Fusion, change of identity; air resistance Instructions Reading: Sections 6.7-6.10 The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. [MI2 05.P.82] 8/9 points In a fusion reaction, the nuclei of two atoms join to form a single atom of a different element. In such a reaction, a fraction of the rest energy of the original atoms is converted to kinetic energy of the reaction products. A fusion reaction that occurs in the Sun converts hydrogen to helium. Since electrons are not involved in the reaction, we focus on the nuclei. Hydrogen and deuterium (heavy hydrogen) can react to form helium plus a high-energy photon called a gamma ray: Objects involved in the reaction: Particle # of protons # of neutrons Charge Rest Mass (atomic mass units) 1 H (proton) 1 0 + e 1.0073 2 H (deuterium) 1 1 + e 2.0136 3 He (helium) 2 1 +2 e 3.0155 gamma ray 0 0 0 0 Although in most problems you solve in this course you should use values of constants rounded to 2 or 3 significant figures, in this problem you must keep at least 5 significant figures throughout your calculation. Problems involving mass changes require many significant figures because the changes in mass are small compared to the total mass. In this problem you must use the following values of constants, accurate to 5 significant figures: Constant Value to 5 significant figures c (speed of light) 2.9979e8 m/s e (charge of a proton) 1.6022e-19 coulomb Ch6 HW3 .. 1 of 6 11/18/2008 6:25 PM
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atomic mass unit 1.6605e-27 kg 8.9875e9 N·m 2 /C 2 The diagrams below represent different states in the fusion process: (a) (b) (c) A proton ( 1 H nucleus) and a deuteron ( 2 H nucleus) start out far apart. An experimental apparatus shoots them toward each other (with equal and opposite momenta). If they get close enough to make actual contact with each other, they can react to form a helium-3 nucleus and a gamma ray (a high energy photon, which has kinetic energy but zero rest energy). Consider the system containing all particles. Work out the answers to the following questions on paper, using symbols (algebra), before plugging numbers into your calculator.
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This note was uploaded on 02/21/2010 for the course PHYS 2211 taught by Professor Prog during the Spring '09 term at Georgia Institute of Technology.

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Ch6 HW3 - Ch6 HW3

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