Week 4 DQ's

Week 4 DQ's - 1) Conditions do you need to have Nuclear...

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1) Conditions do you need to have Nuclear Fusion? Why do you expect to only see this naturally occur in the core of our Sun (or another star)? The conditions that you would need to have a Nuclear Fusion would be high temperature and high density. The reason that you would need high temperatures would be so that the atomic nuclei can collide with each other at a high velocity to get close enough together to fuse. If the gas is cooler then 5 to 10 million K, hydrogen can’t fuse because the protons don’t collide violently enough. The reason that you would need high densities would be to make sure that there are enough nuclei so the collisions can take place. The reason that you would be to expect to only see this naturally occur in the core of the sun would be because the sun is a ball of very hot gas held together by it’s own gravity, but gravity cannot make the sun collapse because it generates energy at its center. That keeps the gas hot, and the outward pressure of the gas balances in the inward pull of gravity. The solar atmosphere
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This note was uploaded on 01/17/2010 for the course PHY 110 taught by Professor Smith during the Spring '09 term at Upper Iowa.

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