Coherent monochromatic light of wavelength 632.8 nm passes through a pair of thin parallel slits. The figure shows the central portion of the pattern of bright fringes viewed on a screen 1.40 m beyond the slits. What is the distance between the two slits?
A) 0.0703 mm
B) 0.141 mm
C) 0.281 mm
D) 0.562 mm
E) 0.633 mm
Answer: C
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For the x-ray diffraction pattern in Figure 15.4 produced with copper K? of wavelength 0.1541 nm, assume that this is some unknown material, but it has been determined that the material is cubic by Laue diffraction.
(a) Prove that the material is BCC. (b) Determine h, k, and l for each of the lines, but you can ignore the small peak at 35°. This is a K? peak. (c) Determine the lattice parameter of this material using the (321) peak.
During the Cretaceous period, Earth experienced a worldwide rise in sea level caused by
A) melting of glacial ice. B) the thermal expansion of the crustal surface and the breakup of Pangaea. C) subduction of the seafloor. D) subduction of continental land masses.
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How many large moons does Saturn have?
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