Exam__2_11_1_07 - PHYSICS 222, FALL 2007 EXAM #2 NOVEMBER...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
PHYSICS 222, FALL 2007 EXAM #2 NOVEMBER 1, 2007 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 and any other electronic communication devices. ii. Fill in your name, identification number, recitation section number and instructor 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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Problems 31-45 are worth 2 points each. 31. The displacement wave in a traveling sinusoidal sound wave moving along the x-axis in a gas has the wave function y(x,t) = A sin(kx ω t). The amplitude of the pressure wave in the sound wave is ____ . (B is the bulk modulus of the gas) A. BA B. BA/k C. Ak D. Ak/B E. BAk 32. The pressure wave in the third harmonic standing sound wave in the gas in a pipe with one end open and one end closed has _____ nodes. A. 1 B. 2 C. 3 D. 4 E. 5 33. The magnetic field wave in a plane electromagnetic traveling wave in vacuum has the wave function B (z, t) = B max sin(kz + ω t) j ˆ . The electomagnetic wave is moving in the ____ direction. A. k ˆ B. i ˆ C. k ˆ D. j ˆ E. i ˆ 34. Maxwell's equations for electric and magnetic fields in vacuum are: (1) O E · d A = 0 (3) O B · d l = µ o ε o d Φ E dt (2) O B · d A = 0 (4) O E d l = d Φ B dt Which two of these equations can be used to derive the existence and speed of electromagnetic traveling plane waves in vacuum? A. (1) and (2) B. (2) and (3) C. (3) and (4) D. (1) and (3) E. (2) and (4)
Background image of page 2
35. The electric and magnetic fields in a traveling plane electromagnetic wave in vacuum at a particular point in space and at a particular instant of time are E and B , respectively. The direction of propagation of the wave is in the direction of ____ .
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

Exam__2_11_1_07 - PHYSICS 222, FALL 2007 EXAM #2 NOVEMBER...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online