Fundamentals of Physics
Fundamentals of Physics
10th Edition
ISBN: 9781118230732
Author: David Halliday
Publisher: WILEY
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Chapter 43, Problem 41P
To determine

To calculate:

how long will it take a particular star that is burning its helium to last.

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41 O A star converts all its hydrogen to helium, achieving a 100% helium composition. Next it converts the helium to carbon via the triple-alpha process, "He + He + He → 12C + 7.27 MeV. The mass of the star is 4.6 x 102 kg, and it generates energy at the rate of 5.3 x 1030 W. How long will it take to convert all the helium to carbon at this rate?
The Sun generates energy by p-p proton-proton chain nuclear fusion.  The second step of p-p chain is:                          2H + 1H → 3He. The particle masses are 2.0141 u, 1.0078 u, 3.0160 u, for   2H, 1H, 3He, respectively.  This step produces _____ MeV of energy.
For the following reaction, what is the energy released, in GJ/mol? (1 GJ = 1E9 J) Use 2.998E8 m/s as the speed of light 1 a m u has a mass of 1.6605E-27 kg A + 1n → C + D      A          n          C          D        mass (amu) 6.1450         1.0087           3.0221         4.0834         Express your answer as a positive value
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