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PHY213_SampleExam3

# PHY213_SampleExam3 - PHYSICS 213 PRACTICE EXAM 3*The actual...

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PHYSICS 213 – PRACTICE EXAM 3* *The actual exam will contain EIGHT multiple choice quiz-type questions covering concepts from lecture (16 points), ONE essay-type question covering an important fundamental principle from lecture (4 points), and FOUR problems similar to the problems that follow (80 points). NAME (printed) SIGNATURE Student Number SECTION Wait for oral instructions before starting the test. INSTRUCTIONS Remember to show (in English) your problem solving steps for FULL CREDIT. A calculator and a one-sided 8½X11 student reference sheet are permitted. Your reference sheet may contain equations, graphs, and notes; however, quiz questions and worked out problems CANNOT be included. Cell phones/communication devices must be put away. For the graders: Q1-9 P1 P2 P3 P4 TOTAL

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Electromagnetic Waves [20 Points] A large parabolic solar detector with radius 25.0 m is mounted to a solar probe with total mass 2500 kg which is placed in space near the Earth’s orbit. The solar detector absorbs solar radiation with intensity 1340 W/m 2 . a) Find the amplitude of the electric field for the solar radiation? [5 points] Answer: E = 1005 V/m b) Find the amplitude of the magnetic field for the solar radiation? [4 points] Answer: B = 3.35 μT c) Determine the solar power absorbed by the solar detector. [3 points] Answer: P = 2.63 MW d) Ignoring all gravitational effects, determine the acceleration of the solar probe due to the soar radiation pressure. [4 points] Answer: a = 3.51 x 10 -6 m/s 2 e) Find the probe’s speed as it reaches Mars 7.80 x 10 10 m away. Ignore all gravitational effects and assume the probe starts from rest and the solar intensity remains constant. [4 points] Answer: v = 740 m/s
Snell’s Law [20 Points]

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