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Author Question: How many grams of deuterium (atomic mass = 2.014 1 u) must be fused to helium (atomic mass 4.002 6 ... (Read 197 times)

PhilipSeeMore

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on: Jul 28, 2018
How many grams of deuterium (atomic mass = 2.014 1 u) must be fused to helium (atomic mass 4.002 6 u) in one second to produce 3 000 MJ of energy? 1 u = 1.66  10-27 kg

Question 2

The theory of nuclear astrophysics is that all the heavy elements like uranium are formed in the interior of massive stars. These stars eventually explode, releasing these elements into space. If we assume that at the time of the explosion there were equal amount of U-235 and U-238, how long ago did the star(s) explode that released the elements that formed our Earth? The present U-235/U-238 ratio is 0.007 0 . The half-lives of U-235 and U-238 are 0.7  109 yr and 4.47  109 yr.


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Jsherida

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Reply #1 on: Jul 28, 2018
Answer to Question 1

0.005 2 grams

Answer to Question 2

5.9 billion years


PhilipSeeMore

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Reply 2 on: Jul 28, 2018
Great answer, keep it coming :)

aliotak

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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