AP Practice Test ch 22

Transcription

1 AP Practice Test ch 22 Multiple Choice 1. Tripling the wavelength of the radiation from a monochromatic source will change the energy content of the individually radiated photons by what factor? a b. 1.0 c d Photon A has an energy of J. Photon B has 4 times the frequency of Photon A. What is the energy of Photon B? a J b J c J d J 3. According to present theories of light, in some experiments light seems to be: a. composed of particles which can neither be created nor destroyed. b. a particle whose quantized energy depends on its velocity. c. a wave that moves from one place to another if there is material to vibrate. d. none of the above. 4. The wave-particle duality of light means that, in the same experiment: a. light will act both like a wave and like a particle. b. light will act either like a wave or like a particle. c. light will not act like either a wave or a particle. d. light always exists as two waves or as two particles. 5. What is the energy of a photon of frequency Hz? (h = J s) a J b J c J d J 6. Helium-neon laser light has a wavelength in air of nm. What is the energy of a single photon in the beam? (h = J s and c = m/s). a J b J c J d J 7. Newton s theory of light treated light as while Young demonstrated that light behaved as with behavior. a. particles, waves, refractive b. particles, waves, interference c. waves, particles, interference d. waves, particles, refractive 8. The photoelectric effect was discovered by:

2 a. Maxwell. b. Einstein. c. Hertz. d. Planck. 9. Who formulated the theory explaining the photoelectric effect? a. Hertz b. Maxwell c. Newton d. Einstein 10. As the angle of incidence is increased for a ray incident on a reflecting surface, the angle between the incident and reflected rays ultimately approaches what value? a. zero b. 45 c. 90 d A line representing a wave front for a wave should be drawn: a. from the source to the receiver. b. from one crest to the preceding crest. c. along one of the crests of the wave. d. in the direction the wave is moving. 12. When light of one wavelength from air hits a smooth piece of glass at an angle, which of the following will not occur? a. reflection b. refraction c. dispersion d. All of the above will occur. 13. When light reflects and produces a clear image, this reflection is referred to as: a. specular reflection. b. diffuse reflection. c. retroreflection. d. double reflection. 14. A ray of light strikes a thick sheet of glass (n = 1.5) at an angle of 25 with the normal. Find the angle of the refracted ray within the glass with respect to the normal. a. 56 b. 46 c. 25 d A beam of light in air is incident on the surface of a rectangular block of clear plastic (n = 1.49). If the velocity of the beam before it enters the plastic is m/s, what is its velocity inside the block? a m/s b m/s c m/s d m/s 16. A light ray in air enters and passes through a block of glass. What can be stated with regard to its speed after it emerges from the block?

3 a. Speed is less than when in glass. b. Speed is less than before it entered glass. c. Speed is same as that in glass. d. Speed is same as that before it entered glass. 17. As a monochromatic light ray is transmitted through an air-to-glass boundary, what happens to the wavelength? a. increases b. decreases c. remains unchanged d. approaches zero value 18. A monochromatic light source emits a wavelength of 490 nm in air. When passing through a liquid, the wavelength reduces to 429 nm. What is the liquid s index of refraction? a b c d If light from a 560-nm monochromatic source in air is incident upon the surface of fused quartz (n = 1.56) at an angle of 60, what is the wavelength of the ray refracted within the quartz? a. 192 nm b. 359 nm c. 560 nm d. 874 nm 20. A ray of light is incident on a liquid-to-glass interface at an angle of 35. Indices of refraction for the liquid and glass are, respectively, 1.63 and What is the angle of refraction for the ray moving through the glass? a. 23 b. 30 c. 38 d A light ray passes from air through a thin plastic slab (n = 1.3) with parallel sides. If the ray in air makes an angle of 45 with the normal after leaving the slab, what is the angle of incidence for the ray in air as it impinges upon the other side of the slab? a. 33 b. 45 c. 67 d An oil film floats on a water surface. The indices of refraction for water and oil, respectively, are and If a ray of light is incident on the air-to-oil surface at an angle of 37.0 with the normal, what is the incident angle at the oil-to-water surface? a b c d When light from air hits a smooth piece of glass with the ray perpendicular to the glass surface, the part of the light passing into the glass: a. will not change its speed.

4 b. will not change its frequency. c. will not change its wavelength. d. will not change its intensity. 24. An underwater scuba diver sees the sun at an apparent angle of 30.0 from the vertical. How far is the sun above the horizon? (n water = 1.333) a b c d A beam of light is incident upon a flat piece of glass (n = 1.50) at an angle of incidence of 45. Part of the beam is transmitted and part is reflected. What is the angle between the reflected and transmitted rays? a. 28 b. 73 c. 107 d Three materials with n 1 < n 2 < n 3 are arranged in layers of uniform thickness. A light ray in air enters the first layer at an angle of incidence of 30 and the ray eventually exits the third layer at the refracted angle in air. What is the value of? a. Some angle less than 30. b. 30. c. Some angle more than 30. d. Insufficient information to answer. 27. A ray of white light, incident upon a glass prism, is dispersed into its various color components. Which one of the following colors experiences the greatest angle of deviation? a. orange b. violet c. red d. green 28. A certain kind of glass has n blue = for blue light and n red = for red light. If a beam of white light (containing all colors) is incident at an angle of 30.0, what is the angle between the red and blue light inside the glass? a b c d A rainbow is a result of: a. different color droplets of water. b. dispersion. c. interference. d. the Huygens Effect. 30. Huygens s wave theory requires which of the following with regard to the relative speeds of light in glass and in air? a. Speed in air is greater than in glass. b. Speed in air is less than in glass. c. Speed in air equals that in glass.

5 d. Speed in glass equals square root of that in air. 31. A container of flint glass (n = 1.66) holds a small quantity of benzene (n = 1.501). What is the critical angle for internal reflection of a ray in the glass when it is incident on the glass-to-liquid surface? a b c d A ray of light travels across a liquid-to-glass interface. If the indices of refraction for the liquid and glass are, respectively, 1.75 and 1.52, what is the critical angle at this interface? a b c d. Critical angle does not exist. 33. Before light can undergo total internal reflection when incident on material 2 from material 1, what must be true of the indices of refraction? a. n 1 = n 2 b. n 1 < n 2 c. n 1 > n 2 d. Either n 1 or n 2 must be equal to Three flat layers of transparent material are stacked upon one another. The top layer has index of refraction n 1, the middle has n 2 and the bottom one has n 3. If n 1 > n 2 > n 3, and if a ray of light strikes the top layer at an angle of incidence, in which layer is the angle of refraction the greatest? a. the top layer b. the middle layer c. the bottom layer d. Once the ray enters the touching layers, the angle of refraction remains constant. 35. Three flat layers of transparent material are stacked upon one another. The top layer has index of refraction n 1, the middle n 2 and the bottom one n 3. If n 1 > n 2 > n 3, and a ray of light in air strikes the top layer, at which surface given can total internal reflection occur first? a. the top surface b. the surface between materials with indices n 1 and n 2 c. the surface between materials with indices n 2 and n 3 d. Total internal reflection cannot occur at any of these surfaces.