Exam 3--S12--PHYS April 2012

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1 ame: Exam 3--S12--PHYS April 2012 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of the following statements is true? a. Newton believed light was a particle because of refraction. b. Huygens believed light was a wave because of reflection c. Young showed light was a particle through the double-slit experiment d. Einstein showed light was a particle through the photoelectric effect 2. These two mirrors sit at an angle of 120º to one another. A ray of light is incident at 50º on the first mirror. What is the angle of reflection (θ r ), with respect to a perpendicular line to the second mirror, as shown? a. 40 d. 60 b. 50 e. 20 c Which of the following is true? a. n 1 >n 2 c. n 1 <n 2 b. n 1 =n 2 d. Not enough information 1

2 4. What is the speed of light in glass (n=1.5)? a m/s c m/s b m/s d m/s 5. A ray of light is in a medium as shown in this figure. What is the angle, θ, measured from the normal line, that the ray of light emerges from the water? a. 28 c. 33 b. 52 d. 45 2

3 6. Consider the light ray in an acrylic medium shown in this figure. What must be the angle θ 1 for the ray to undergo total internal reflection? a d. 46 b e. Total internal reflection does not occur c Your eye consists of a convex lens that creates an image on your retina. You look at a very distant object, and you eye lens has a particular focal length. In order to focus on a nearby object, how must the focal length of your eye lens change? a. the focal length increases c. the focal length remains the same b. the focal length decreases 8. Which of these appropriately lists the photons in order of energy, from the least energy to the greatest energy? a. x-rays, ultraviolet, radio, infrared c. radio, ultraviolet, infrared, x-rays b. radio, infrared, ultraviolet, x-rays d. infrared, radio, x-rays, ultraviolet 9. Which of these rays is drawn incorrectly? a. (a) c. (c) b. (b) d. all are correct 3

4 10. Most cameras have an aperture to block the outer edges of the lens. What is the purpose of this aperture? a. to eliminate chromatic aberration c. to give the camera a smaller field of view b. to reduce the effects of spherical aberration d. to block flying monkeys from coming into your camera 11. The person in this figure is standing in front of a flat mirror. There is a star in front of the person as shown. Where does the person see the image of the star? a. (a) d. (d) b. (b) e. (e) c. (c) 12. Which of these aberrations occur in mirrors: I. spherical aberrations II. geometric aberrations III. chromatic aberrations IV. diffraction aberrations a. I & IV c. I & III b. I only d. II & III 4

5 13. Where is the image formed by the second lens in this figure? a. 30 cm to the left of lens 2 c. 15 cm to the right of lens 2 b. 100 cm to the right of lens 2 d. there is no image 14. You stand 100 cm in front of a mirror and find that your image is ½ your actual size. What is the focal length of the mirror? (Hint: What kind of mirror is this? Is the magnification positive or negative?) a. -25 cm c cm b. 50 cm d. 33 cm 15. You look in a mirror and see an image of your nose that is bigger than your actual nose. Which of these options correctly give the type of mirror and describe the image? a. convex mirror, virtual image, inverted c. flat mirror, virtual image, upright b. concave mirror, virtual image, upright d. convex mirror, real image, inverted 5

6 16. What can you do to see more of yourself in a flat mirror? a. move towards the mirror c. get a bigger mirror b. move away from the mirror 17. Interference occurs in what type of waves? a. mechanical waves c. light waves b. sound waves d. all of these 18. Which statement best describes the phase of these 2 waves: I. in-phase II. out-of-phase by 1 2 λ III. out-of-phase by 90 û IV. out-of-phase by 180 û V. out-of-phase by 1 λ a. II & IV d. II & III b. IV & V e. I c. II 19. Two coherent waves have a wavelength of 4 m. The first wave travels a distance of 3 meters, and the second wave travels a distance of 11 meters. Then, the two waves recombine. What type of interference occurs? a. destructive b. constructive 20. A diffraction grating has 540 lines/mm. How far apart are two adjacent slits on the grating? a m c m b m d m 6

7 21. A laser beam (λ = 650 nm) is incident on two slits mm apart. How far is the second bright fringe from the central maxium on a screen 5 meters away? a. 6.5 cm c. 0.5 cm b. 12 cm d. 3.2 cm 22. In a Young's double-slit interference apparatus, by what factor is the distance between adjacent light and dark fringes changed when the separation between slits is doubled? a. 1/4 c. 1/2 b. 2 d After light from a source passes through two slits, a first order bright spot is seen on the wall at point P. Which labeled distance is necessarily equal to the wavelength of the light? a. (a) c. (c) b. (b) d. (d) 7

8 24. At what angle will the second order maximum occur for a wavelength of 400 nm using a diffraction grating with lines per cm? a c. 24 b. 53 d. No second order maximum will occur in this case. 25. Light of 500 nm is incident on a double slit of width 1000 nm. What is the highest order present in the diffraction pattern? a. 1 c. 3 b. 2 d This is version B. Choose B for this question a. A c. C b. B d. D 8

9 ID: A Exam 3--S12--PHYS April 2012 Answer Section MULTIPLE CHOICE 1. ANS: D PTS: 1 2. ANS: C PTS: 1 3. ANS: A PTS: 1 4. ANS: D PTS: 1 5. ANS: D PTS: 1 6. ANS: D PTS: 1 7. ANS: B PTS: 1 8. ANS: B PTS: 1 9. ANS: B PTS: ANS: B PTS: ANS: C PTS: ANS: B PTS: ANS: D PTS: ANS: C PTS: ANS: B PTS: ANS: C PTS: ANS: D PTS: ANS: A PTS: ANS: B PTS: ANS: A PTS: ANS: A PTS: ANS: C PTS: 1 DIF: ANS: A PTS: ANS: B PTS: 1 DIF: 2 TOP: 24.8 The Diffraction Grating 25. ANS: B PTS: ANS: B PTS: 1 1

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