(Problem 17) 12. How much energy is produced when the Sun converts 1 kg of 13. A
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Question
(Problem 17)
12. How much energy is produced when the Sun converts 1 kg of 13. A 1-megaton nuclear weapon produces about 4 × 10'5of 14. A solar flare can release 1025 J. How many megatons of TNT hydrogen into helium? (Hint: How does this problem differ from Problem 11?) energy. How much mass must vanish when a 1-megaton weap explodes? would be equivalent? (See Problem 13 for conversion between megatons and joules.) 15. The United States consu mes about 2.5 × 1019 J of energy in all forms in a year. How many years could you run the United States on the energy released by the solar flare in Problem 14? 16. Use the luminosity of the Sun (the total amount of energy the Sun emits each second) to calculate how much mass the Sun converts into energy each second. 17. If the Sun began its life with 75 percent H and 25 percent He by mass, by how much did the respective percentages by mass change to result in the percentages listed in Table 8-1? Why are these changes in percentages not equal?Explanation / Answer
Percentage change in Hydrogen = (70.6-75)*100/75
= - 5.87 %
Percentage change in Helium = (27.5-25)*100/25
= 10%
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