exam1_001

# exam1_001 - Physics 3101, Introduction to Modern Physics,...

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Introduction to Modern Physics , Spring 2005 EXAM #1 Friday, February 11, 2005 Instructions Read each problem carefully before starting. Choose 3 of the following 4 problems. Remember to work each problem as fully as possible. Partial credit will be given so SHOW ALL OF YOUR WORK!! Constants: c = 3 x 10 8 m/s h = 6.63 x 10 -34 J s = 4.14 x 10 -15 eV s h = h/2 π k = 0 4 1 πε = 8.99 x 10 9 N m 2 /C 2 hc = 1240 eV nm k = Boltzmann’s constant = 1.38 x 10 -23 J/K = 8.61 x 10 -5 eV/K m e = 9.11 x 10 -31 kg 1 MeV/c 2 = 1.783 x 10 -30 kg 1. A person gets in a spaceship and makes a roundtrip journey to the star Sirius A, located 8.6 light years away. According to the person, the total time elapsed during the entire voyage is 4 years. (a) How fast was the spaceship traveling? Assume constant velocity for the entire journey. Hint: Analyze the problem using length contractions from the point of view of the spaceship.(13 points) (b) How much time has elapsed on earth during the time the spaceship was away? (10

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## This note was uploaded on 12/15/2011 for the course PHY 3101 taught by Professor Staff during the Fall '08 term at University of Florida.

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exam1_001 - Physics 3101, Introduction to Modern Physics,...

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