Physics of Everyday Phenomena
Physics of Everyday Phenomena
9th Edition
ISBN: 9781259894008
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
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Chapter 19, Problem 35CQ
To determine

Whether the nuclear fission is the main reaction involved in the energy generated in the sun.

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how does the model shows how the reaction inside the Sun leads to the release of energy and how the reaction complies with the Law of Conservation of Matter
A nuclear fusion reaction in the Sun converts 4 H nuclei to 1 He-4 nucleus. Each Hydrogen nuclei is 1.007825u (an atomic mass unit); one Helium nucleus is 4.00268u.  What is the mass lost in the process (in u)? What is the % of the original mass?  Write down the equation that determines the energy produced in this process. Calculate the energy created from 1 kilogram of hydrogen fused. (with units kg & m/s, answer will be Joules) The Sun’s luminosity (or power) is 4 x 1026 Watts (=J/s). How many kilograms of hydrogen must be fused every second to maintain this luminosity? (hint: work backwards from the energy per second to the mass released to the amount of hydrogen required, using the results from the previous question.) The Sun’s mass is ~2x1030 kg. If 10% of this is Hydrogen available in the core, how long will the Sun be able to continue fusing hydrogen at this rate? This is considered the Sun's "lifetime". If the Sun is 4.6 billion years old (and assuming it's power…
The proton – proton cycle responsible for the Sun’s 3.84 x 1026 W power output yields about 26.7 MeV of energy for every four protons that are fused into a helium nucleus. Determine (a) the energy in joules released during each proton – proton cycle fusion reaction, (b) the number of proton – proton cycles occurring per second in the Sun, and (c) the change in the Sun’s mass each second due to this energy release.
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