GEOL 101 1st Edition Lecture 18 Outline of Last Lecture I Review and test things Outline of Current Lecture I Why does the sun shine II Sun s structure III Nuclear fusion Current Lecture I II III Why does the sun shine The sun is not on fire it is powered by nuclear energy What is the Sun s structure a The weights of its upper layers compress its lower layers Nuclear reactions only occur in the sun s core where it is hottest b Radius 109 times Earth s c Mass 300 000 times Earth s d Luminosity 3 8 x 10 26 watts e With these values we can calculate how much mass the sun is converting into energy f Parts of the sun in no particular order Core radiation zone convection zone photosphere radiation zone chromosphere corona solar wind sunspots Nuclear fusion in the sun a Fission making 2 nucleus from one Fusion making one nucleus from 2 nuclei sticking together b High temperatures allow fusion c PP chain in the sun proton proton chain pressing 4 protons hydrogen nuclei together and releasing some energy forming helium d What would happen inside the Sun if a slight rise in core temperature let to a rapid rise in fusion it would expand and then cool down These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute
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