214F07Pre2

# 214F07Pre2 - Physics 214 PRELIM II November 1 2007 Name...

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Page 1 of 10 Physics 214 PRELIM II November 1, 2007 Name: _________________________________________ Signature: _______________________________________ Section # and TA: ________________________________ Score: Part Possible points Score I 40 II 25 III 15 IV 20 Total 100 This examination is closed books and closed notes . No calculators or other electronic devices are permitted . A formula sheet and scratch paper are provided. Use the space provided after each question for your answers and write your final answers in the boxes provided. If you need more room for a problem, write "over" and continue on the back. Cross out anything that should not be considered part of your answer. The scratch paper will not be graded. In all but Part I, you must show your work to get full credit . Make sure you have all 10 pages. By signing this exam you certify that you adhere to the Cornell academic integrity code. Good luck!

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Page 2 of 10 Part I: Short answer questions 1-8 (40 points – 5 points each) 1. Two ideal polarizers have their axes of transmission perpendicular to each other so that no light is transmitted. A third polarizer is inserted between these two with transmission axis at 45 ° to either of the two crossed polarizers’ transmission axes. Randomly polarized light of intensity I 0 is incident on this system. What is the intensity of transmitted light? (A) 2 / 0 I (B) 2 / 0 I (C) 2 2 / 0 I (D) 4 / 0 I (E) 8 / 0 I (F) 0 2. A police car is moving away from where you are standing with velocity v sounding its siren. The wind is blowing in the direction opposite to the police car towards you with twice its velocity, 2 v . Your observed frequency of the police siren compared to the case of non-moving police car in absence of any wind is: (A) Higher (B) Lower (C) The same 3. The Poynting vector of a circularly polarized traveling EM wave is pointing in – x direction (assume the regular right-handed Cartesian coordinate system). At a given instant of time, the magnetic field at point P is in – y direction. What is the direction of the electric field at point P at the same instant? (A) – x (B) + x (C) – y (D) + y (E) – z (F) + z (G) It is not defined (circular polarization) 4. A satellite emits a spherical radio wave in all directions with an average power of 10 W. The amplitude of the magnetic field of the wave is measured by another satellite at two different positions: B 1
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214F07Pre2 - Physics 214 PRELIM II November 1 2007 Name...

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