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EAS1601_Sample_Exam2_A

# EAS1601_Sample_Exam2_A - EAS 1601 Exam 2 Sample A This is a...

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EAS 1601 Exam 2, Sample A This is a sample exam. There is the possibility that the answers here are not correct. Make sure that you carefully determine the correct answers yourself. Although you will be given a formula sheet for the actual exam, all formulae and constants you need for studying are available in your lecture notes.

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Name ________________________________ Lab Section______________ 2 1. Consider a star which has a radius of 5 million (5 x 10 6 ) Km, a temperature of 10 4 K and a mass of 10 32 Kg, Its source of energy is Helium Fusion ( 4 He + 4 He + 4 He 12 C ). At present time the star is composed of 90% Helium. [Hint: You may assume that He has 4.0026 amu and that C has 12 amu] a. What is the luminosity of this star? [5 Points] b. How long will it be until the star burns up all the helium? [15 Points]
Name ________________________________ Lab Section______________ 3 2. Will our Sun supernova? Explain why or why not [5 Points] No it does not have sufficient mass to create the critical mass necessary to create the critical density to create a black hole when it runs out of fuel and collapses due to gravity.

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