214_final_12_11_07D - FINAL December 11, 2007 Name: _...

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Page 1 of 14 Physics 214 FINAL December 11, 2007 Name: _________________________________________ Signature: _______________________________________ Section # and TA: ________________________________ Score: Part Possible points Score I 40 II 24 III 24 IV 12 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 14 pages. Please write your name on each page. By signing this exam you certify that you adhere to the Cornell academic integrity code. Good luck!
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Page 2 of 14 Part I: Multiple Choice (4 points each for 10 questions) You do not need to show work. Just give your answer in the boxes. 1). Which of the following is an example of tunneling (list all that apply)? (A) An electron is liberated from a metal when an electric field is applied, even though its potential energy should have it classically trapped according to the value of the material’s work function. (B) A beam of light strikes a piece of metal and sends an electron speeding away from its surface. (C) By means of electrons, electricity is conducted through a single piece of metal. (D) A flash of light appears on an old glow-in-the-dark clock dial indicating that an alpha particle has left a nucleus. 2) Which of the following is not true of a photon? (A) λ / h p = (B) / c f = (C) Its dispersion relation is not linear. (D) c p E =
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Page 3 of 14 3) Light in air is reflected from a lens that has an antireflective coating of thickness t with index of refraction n = 1.38. The glass under the coating has n = 1.50. What is the condition for destructive interference in the reflected light? λ 0 is the wavelength in air and m is any positive integer. (Assume normal incidence.) (A) t = mn 0 (B) t = m 0 / n (C) t = ( m – ½) n 0 (D) t = ( m – ½) 0 / n (E) 2 t = mn 0 (F) 2 t = m 0 / n (G) 2 t = ( m – ½) n 0 (H) 2 t = ( m – ½) 0 / n 4) A transmission grating with slit spacing d = 2.1 μ m and slit width a = 0.7 μ m is illuminated with light of wavelength 0.6 μ m. What is the total number of principal maxima that can be seen? (A) 2
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This note was uploaded on 05/14/2008 for the course PHYS 2214 taught by Professor Giambattista,a during the Spring '07 term at Cornell University (Engineering School).

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214_final_12_11_07D - FINAL December 11, 2007 Name: _...

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