F05Exam2 - PHYSICS 222, FALL 2005 EXAM #2 NOVEMBER 3, 2005...

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PHYSICS 222, FALL 2005 EXAM #2 NOVEMBER 3, 2005 Name (printed): __________________________________________ Nine-Digit ID Number: __________________________________________ Section Number: __________________________________________ Recitation Instructor: __________________________________________ INSTRUCTIONS: i. Put away all materials except for pens, pencils, erasers and your calculator. Turn off your cell phone if you have one. ii. Fill in your name, identification number, and section number above. iii. This is a two-hour exam. The exam contains 15 multiple choice problems worth 2 points each (problems 31-45), and 15 multiple choice problems worth 4 points each (problems 46-60), for a total of 30 problems worth 90 course points. iv. In marking the multiple choice answer sheet use a number 2 pencil. Do NOT use ink. If you did not bring a pencil, ask for one. Fill in the appropriate circles completely. If you need to change any entry, you must completely erase your previous entry. v. Carefully read each problem completely and its five possible answers before beginning to work the problem. For each problem, select one answer that is closest to the correct one. vi. Please turn over or cover your answer sheet when you are not marking it. vii. Before handing in your exam, make sure that your answers on the bubble sheet are what you intend them to be. Copy down your answers on a piece of unused scratch paper for comparison with the answer key to be posted later. viii. When you are finished with the exam, please place all exam materials, including the answer sheet, the exam itself and scratch paper, in your folder and return the folder to your recitation instructor. GOOD LUCK!!
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In this exam, assume: 1. the bulk modulus of air is 140 kPa 2. the traveling sound wave speed in air is 340 m/s 3. the index of refraction of air or vacuum is 1.00 4. the index of refraction of glass is 1.50 5. the index of refraction of water is 1.33 6. the speed of light in vacuum or air is 3.00 × 10 8 m/s Problems 31-45 are worth 2 points each. 31. Standing sound waves are produced in a pipe that is 0.90 m long. The pipe is closed at the left end and open at the right end. For the third harmonic mode, the air displacement nodes are ____ m and ____ m from the left end of the pipe. A. 0.00 and 0.45 B. 0.00 and 0.60 C. 0.00 and 0.90 D. 0.30 and 0.90 E. 0.30 and 0.60 32. Two side-by-side speakers isotropically emit sound waves with the same amplitude but slightly different frequencies f 1 and f 2 , respectively. The beat frequency you hear is ____ . A. f 1 + f 2 B. 2(f 1 + f 2 ) C. | f 1 f 2 | D. 2| f 2 f 1 | E. | f 1 f 2 | / 2 33. The wavelength of a 680 Hz sound wave in air is ____ m. A. 0.1 B. 0.2 C. 0.3 D. 0.4 E. 0.5 34. At a distance D from a light bulb emitting light equally in all directions, the light intensity is I 0 . At a distance of D/2 from the light bulb, the light intensity is ____ . A. I 0 B. 2 I 0 C. I 0 / 2 D. 4 I 0 E. I 0 / 4 35. An electromagnetic plane wave in vacuum is moving in the + y direction. At time t = 0 and at position (x,y,z) = (0,0,0), the electric field is pointing in the + z direction. At that time and position, the magnetic field in the wave is pointed in the ____ direction.
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This note was uploaded on 02/11/2012 for the course PHYSICS 222 taught by Professor Ogilvie during the Fall '05 term at Iowa State.

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F05Exam2 - PHYSICS 222, FALL 2005 EXAM #2 NOVEMBER 3, 2005...

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