Exam__2_11_1_07

# Exam__2_11_1_07 - PHYSICS 222 FALL 2007 EXAM#2 NOVEMBER 1...

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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)
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 ____ .

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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_1_07 - PHYSICS 222 FALL 2007 EXAM#2 NOVEMBER 1...

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