from 10-1m(X-ray) to a few meters be, in order to Spring 2018 1a Astronomers obs
ID: 2306129 • Letter: F
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from 10-1m(X-ray) to a few meters be, in order to Spring 2018 1a Astronomers observe the universe using signals of wavelengths ranging (radiol For a radio telescope observing 10 GHe signals, how large should its angular features on the order of 10- rad (sensitive enough to observe an E orbit of an astronomical Earth-like orbit of an object around stars nearest to us )? a) S0 meter b)500 meters 5000 meters d) 50000 meters el Radio signals cannot be used to resolve very fine features A thin olfimlindex of refraction 1 pattem in the light reflected from the layers of oll and water. If, keeping everyt redraction of the thin oll filn was increased (for example, up to 1.8), how 51 ying on top of water (index of refraction 1.33) exhibits an would the erence pattern change? a) Spacing between bright fringes gets broader b) Spacing between bright fringes gets narrower c) Spacing between bright fringes get broader and spacing between dark fringes get narrower Not change at all or to scale) 2. A micrescope slide is separated from a glass plate at one end by a sheet of paper. As shown on right, the other end of the slide is in contact with the plate. The slide is illuminated from above by a monechromatic light ( 500 nm). The thickness of the paper is Glass slide Air Paper 0um Approximately how many bright fringes are seen across the glass plate 60 and the microscope slide? Choose the closest answer Glass plate 90 d 120 d 150 e 180 18. When two waves destructively interfere, which is NOT a possible phase difference between them? hoseALL correct answers b) 2r c 3rExplanation / Answer
13.Destructive Interference occuso when the phase dudifferen a odd multiple of ?.So answer is option b and d.
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