conceptual problems - Quiz 1 NAME: 1. Which of the...

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Unformatted text preview: Quiz 1 NAME: 1. Which of the following is NOT true for electromagnetic waves? A. they consist of changing electric and magnetic fields B. they travel at different speeds in vacuum, depending on their frequency C. they transport energy D. they transport momentum E. they can be reflected 2. Maxwells equations predict that the speed of light in free space is: A. an increasing function of frequency B. a decreasing function of frequency C. independent of frequency D. a function of the distance from the source E. a function of the size of the source 3. Which of the following types of electromagnetic radiation travels at the greatest speed in a vacuum? A. radio waves B. visible light C. x rays D. gamma rays E. all of these travel at the same speed 4. In a plane electromagnetic wave in vacuum, the ratio E/B of the amplitudes in SI units of the two fields is: A. the speed of light B. an increasing function of frequency C. a decreasing function of frequency D. 2 E. 1/2 5. If the electric field in a plane electromagnetic wave is along the y axis and its component is given by E m sin(kx- t), in SI units, then the magnetic field is along the z axis and its component is given by: A. (E m /c)cos(kx- t) B. -(E m /c)cos(kx- t) C. -(E m /c)sin(kx- t) D. E m cos(kx- t) E. (E m /c)sin(kx- t) 6. For an electromagnetic wave, the direction of the vector E B gives: A. the direction of the electric field B. the direction of the magnetic field C. the direction of wave propagation D. the direction of the electromagnetic force on a proton E. the direction of the emf induced by the wave 7. An electromagnetic is transporting energy in the negative y direction. At one point and one instant the magnetic field is in the positive x direction. The electric field at that point and instant is: A. positive y direction B. negative y direction C. positive z direction D. negative z direction E. negative x direction 8. Polarization experiments provide evidence that light is: A. a longitudinal wave B. a stream of particles C. a transverse wave D. some type of wave E. nearly monochromatic 9. Light from any ordinary source (such as a flame) is usually: A. unpolarized B. plane polarized C. circularly polarized D. elliptically polarized E. monochromatic 10. Three polarizing sheets are placed in a stack with the polarizing directions of the first and third perpendicular to each other. What angle should the polarizing direction of the middle sheet make with the polarizing direction of the first sheet to obtain zero transmitted intensity when unpolarized light is incident on the stack? A. 0 B. 30 C. 45 D. 60 E. all angles allow light to pass through 11. As used in the laws of reflection and refraction, the normal direction is: A. any convenient direction B. tangent to the interface C. along the incident ray D. perpendicular to the electric field vector of the light E. perpendicular to the interface 12. The relation n 1 sin 1 = n 2 sin 2 , which applies as a ray of light strikes an interface between two media, is known as: A. Gauss Law A....
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conceptual problems - Quiz 1 NAME: 1. Which of the...

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