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Unformatted text preview: Physics 273 Practice Exam II Fall 2011 Prof. Mohan Kalelkar Your name sticker with exam code 1. The exam will last from 1:45pm to 2:50pm. Use a # 2 pencil to make entries on the answer sheet. Enter the following id information now, before the exam starts. 2. In the section labelled NAME, enter your last name, then fill in the empty circle for a blank, then enter your first name, another blank, and finally your middle initial. 3. Under STUDENT # enter your 9-digit Student ID Number. Under COURSE enter 273. Under CODE enter the exam code given above. 4. During the exam, you may use pencils, a calculator, and ONE 8 1 2 11 sheet of paper with formulas and notes. 5. There are 16 multiple-choice questions on the exam. For each ques- tion, mark only one answer on the answer sheet. There is no subtrac- tion of points for an incorrect answer, so even if you cannot work out the answer to a question, you should make an educated guess. At the end of the exam, hand in only the answer sheet. Retain this question paper for future reference and study. 6. Useful numerical constants are given on the next page. Before starting the exam, make sure that your copy contains the page of constants and all 16 questions. Bring your exam to the proctor if this is not the case. Elementary charge e = 1 . 6 10 19 C 1 electron volt ( eV ) = 1 . 6 10 19 J Speed of light c = 3 10 8 m/s Plancks constant h = 6 . 63 10 34 J s = 1240 nm eV/c h = h/ 2 Compton wavelength of electron h/mc = 0 . 0024 nm Ground-state energy of hydrogen =- 13 . 6 eV Rydberg constant R = 0 . 0109678 nm 1 Avogadros number = 6 . 02 10 23 molecules/mole Electron mass = 9 . 11 10 31 kg = 0 . 511 MeV/c 2 Proton mass = 1 . 673 10 27 kg = 938 . 3 MeV/c 2 Neutron mass = 1 .....
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