Homework Handout 5 - HW5 Due Thursday March 6 If words are required in an answer then the answer should be expressed in a complete sentence If a number

Homework Handout 5 - HW5 Due Thursday March 6 If words are...

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HW5: Due Thursday March 6 If words are required in an answer, then the answer should be expressed in a complete sentence. If a number is required in an answer, then the number should have the correct number of significant figures, and should include units. If you are asked a multiple choice question, you are required to indicate all correct answers (and there may be more than one). Remember to show all work, and be legible and clear. Your homework should be returned on a separate piece of paper. 1. The following questions address the source of the Sun’s energy. a) What is the difference between nuclear fission and nuclear fusion ? Which one is used in nuclear power plants? Which one does the Sun use? b) Why does nuclear fusion require high temperatures and pressures? Does nuclear fusion occur throughout the Sun or only in specific areas? Why? c) Does the Sun’s fusion rate remain steady or vary wildly? Describe the feedback process that regulates the fusion rate. 2. Why do sunspots appear dark in pictures of the Sun? A) They are too cold to emit any visible light.
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