Chapter 36:DIFFRACTION1. Sound difers from light in that sound:A. is not subject to difractionB. is a torsional wave rather than a longitudinal waveC. does not require energy for its originD. is a longitudinal wave rather than a transverse waveE. is always monochromaticans: D2. Radio waves are readily difracted around buildings whereas light waves are negligibly difractedaround buildings. This is because radio waves:A. are plane polarizedB. have much longer wavelengths than light wavesC. have much shorter wavelengths than light wavesD. are nearly monochromatic (single frequency)E. are amplitude modulated (AM).ans: B3. Difraction plays an important role in which of the following phenomena?A. The sun appears as a disk rather than a point to the naked eyeB. Light is bent as it passes through a glass prismC. A cheerleader yells through a megaphoneD. A farsighted person uses eyeglasses of positive focal lengthE. A thin soapflm exhibits colors when illuminated with white lightans: C4. The rainbow seen after a rain shower is caused by:A. difractionB. interferenceC. refractionD. polarizationE. absorptionans: C5. When a highly coherent beam of light is directed against a veryfne wire, the shadow formedbehind it is not just that of a single wire but rather looks like the shadow of several parallelwires. The explanation of this involves:A. refractionB. difractionC. reFectionD. the Doppler efectE. an optical illusionans: BChapter 36: DIFFRACTION541
6. When the atmosphere is not quite clear, one may sometimes see colored circles concentric withthe Sun or the Moon. These are generally not more than a few diameters of the Sun or Moonand invariably the innermost ring is blue. The explanation for this phenomena involves:A. refectionB. refractionC. interferenceD. difractionE. the Doppler efectans: D7. The shimmering or wavy lines that can often be seen near the ground on a hot day are due to:A. Brownian movementB. refectionC. refractionD. difractionE. dispersionans: C8. A point source of monochromatic light is placed in front of a soccer ball and a screen is placedbehind the ball. The light intensity pattern on the screen is best described as:A. a dark disk on a bright backgroundB. a dark disk with bright rings outsideC. a dark disk with a bright spot at its centerD. a dark disk with a bright spot at its center and bright rings outsideE. a bright disk with bright rings outsideans: D9. In the equation sinθ=λ/afor single-slit difraction,θis:A. the angle to theFrst minimumB. the angle to the second maximumC. the phase angle between the extreme raysD.NπwhereNis an integerE. (N+1/2)πwhereNis an integerans: A10. In the equationφ=(2πa/λ)sinθfor single-slit difraction,φis:A. the angle to theFrst minimumB. the angle to the second maximumC. the phase angle between the extreme raysD.NπwhereNis an integerE. (N/2)πwhereNis an integerans: C542Chapter 36: DIFFRACTION
11. No fringes are seen in a single-slit dif
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