Exam _2 11_2_06 - PHYSICS 222, FALL 2006 EXAM #2 NOVEMBER...

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PHYSICS 222, FALL 2006 EXAM #2 NOVEMBER 2, 2006 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 the answers on your 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 that you used for the exam, 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. In a traveling sound wave in a gas, the pressure wave is shifted by ____ wavelength with respect to the displacement wave. A. 0 B. 1/8 C. 1/4 D. 3/8 E. 1/2 32. A standing sound wave in a pipe has ___ A. a displacement wave node and a pressure wave node at an open end. B. a displacement wave node and a pressure wave antinode at a closed end. C. a displacement wave node and a pressure wave antinode at an open end. D. a displacement wave antinode and a pressure wave node at a closed end. E. a displacement wave antinode and a pressure wave antinode at an open end. 33. Two small speakers emit sound waves isotropically in phase with each other at a wavelength λ . The distance of a microphone from speaker #1 is s 1 and the distance of the microphone from speaker #2 is s 2 . The microphone will detect no sound if |s 1 s 2 | = ____. (Ignore the decrease in amplitude of the sound wave emitted by each speaker with increasing distance from the speaker) A. 3 λ /2 B. 5 λ /4 C. λ D. 7 λ /8 E. 3 λ/4 34. At a particular point in space at a particular instant of time, the electric and magnetic field directions in an electromagnetic plane wave in vacuum are i ˆ and k ˆ , respectively. The direction of propagation of the wave is 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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Exam _2 11_2_06 - PHYSICS 222, FALL 2006 EXAM #2 NOVEMBER...

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