Light of wavelength 600 nm is reflected from the film and horizontal dark lines appear. What is the ratio of their intensities, I1/I2? a) 20 b) 5.1 c) 2.3 d) 1.5 e) 1.3Īns: b 15) A thin film of soapy water, n = 1.37, is held vertical. a) 6 b) 8 c) 10 d) 14 e) 2 Ans: dġ3) If two coherent waves, one with intensity 8.0 units and the other with intensity 4.0 units, undergo destructive interference, what is the resulting intensity? a) 4.0 units b) 6.0 units c) –4.0 units d) 1.9 units e) 0.7 units Ans: eġ4) Wave 1 has amplitude of 9.0 units and wave 2 has amplitude 4.0 units. The amplitude of the superposed wave is _ units. One wave has amplitude 8 units and the other has amplitude 6 units. a) 0 b) I0 c) 2 I0 d) 3 I0 e) 4 I0 Ans: e 12) Two coherent waves reach the same point in phase. The amplitude of the superposed wave is _. a) 0 b) A c) 2 A d) 3 A e) 4 A Ans: c 11) Two coherent waves, each with intensity I0, reach the same point in phase. Ans: eġ0) Two coherent waves, each with amplitude A, reach the same point in phase. e) their phase difference is an odd integral multiple of π rad. d) their phase difference is an even integral multiple of π rad. the width of the central maximum decreases, but the other maxima do not change in position or width.Īnswer: B 9) A general condition that two waves undergo destructive interference is a) their phase difference is zero. the width of the central maximum increases, but the other maxima do not change in position or width. (central maximum wider other maxima farther from it) it does not affect the size of the pattern. (central maximum less wide other maxima in closer to it) the pattern increases in size. If the width of the slit is decreased, a. e.Īnswer: c 8) When you look at a single slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central maximum and a number of maxima on either side, their intensity decreasing with distance from the central maximum. What is the first order angular separation between the two spectral lines obtained with a diffraction grating with 5000 rulings/cm? a. b.Īnswer: a 7) The hydrogen spectrum has a red line at 656 nm, and a blue line at 434 nm. Answer: CĦ) How wide must a narrow slit be if the first diffraction minimum occurs at ☑2° with laser light of 633 nm? a. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the distance from the slit to the screen is doubled? A) It will be cut to one-quarter its original size. Answer: C 5) A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength is doubled? A) It will be cut to one-quarter its original size. Answer: B 4) A single-slit diffraction pattern is formed on a distant screen. What happens to the central bright fringe? A) It becomes wider. If the first order dark fringe of the resulting diffraction pattern is at an angle of 4.31°, what is the wavelength of light? A) 827 nm B) 301 nm C) 602 nm D) 402 nm Answer: A 3) In a single slit diffraction experiment, the width of the slit through which light passes is increased. If the beam of light of wavelength 600 nm passes through the slit and forms a diffraction pattern on the screen, what is the linear distance on the screen from the center of the diffraction pattern to the second dark fringe? A) 3.9 cm B) 4.2 cm C) 2.1 cm D) 8.5 cm Answer: D 2) In a single-slit diffraction experiment, a beam of monochromatic light passes through a slit of width 11.0 mm. Test IV Name_ 1) In a single slit diffraction experiment, the width of the slit is 3.1 × 10-5 m and the distance from the slit to the screen is 2.2 m.
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