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Physics Problems 285

Physics Problems 285 - Chapt 37 Diffraction 281 intensity...

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Unformatted text preview: Chapt. 37 Diffraction 281 intensity I (r ) = 0: e.g., a region of shadow. What can you say about the diffraction patterns cast by the two masks in regions of shadow. 037 qfull 00300 1 3 0 easy math: gyrinid beetle Extra keywords: (HRW-916:36E) 5. Tropical gyrinid beetles (whirligig beetles) have scales whose alignment makes up a scattering (or reflection) diffraction grating. The diffraction pattern from the grating may confuse predators. Say 0.555 µm light (green light: HZ-56) is incident normal to the beetle grating and a 1st order maximum is seen at an angle of 26◦ from the normal. a) What is the grating spacing? b) What angle of the 2nd order maximum? c) Ordinarily the grating will scatter white light. What would you see if you projected this light on a screen? What would you see if you were looking at the beetle? Assume the beetle grating works like an ideal grating. Real beetles may be less than ideal gratings. 037 qfull 00400 1 3 0 easy math: X-ray diffraction, Bragg law Extra keywords: (HRW-917:53E) 6. You shine 1.2 ˚ X-rays on a crystal of lithium floride. A a) The 2nd order reflection occurs at a Bragg angle of 28◦ . What is the interplanar spacing in Angstroms for this reflection? HINT: Recall that the convention in X-ray diffraction is to measure angle from the surface of scattering, not from the normal as in visual optics. b) What is the angle of the 1st order reflection for the interplanar spacing? ...
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