Physics 1 Problem Solutions 277

Physics 1 Problem Solutions 277 - 9 “Let’s play...

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Chapt. 36 Interference 273 c) Huygens’ principle. d) the Huygens-Fresnel principle. e) Kirchho±’s scalar theory of light. 036 qmult 00600 1 1 5 easy memory: photons and wave trains 6. Quantum mechanical photons or coherent groups of photons (produced by stimulated emission such as occurs massively in lasers) can be identi²ed with the classical: a) wave horses. b) wave iron horses. c) wave donkeys. d) wave chariots. e) wave trains. 036 qmult 00700 1 1 3 easy memory: coherence 7. Coherence (in regard to wave phenomena) is the property of having: a) logical consistency. b) a random phase relation in space and/or time. c) a de²nite phase relation in space and/or time. d) stickiness. e) logical inconsistency. 036 qmult 00800 1 1 3 easy memory: in phase 8. If waves are in phase, they a) are incoherent. b) have a non-zero phase di±erence. c) have a zero phase di±erence. d) have a periodic time-varying phase di±erence. e) have a good working relationship. 036 qmult 00900 1 4 5 easy deducto-memory: complete destructive interference
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Unformatted text preview: 9. “Let’s play Jeopardy ! For $100, the answer is: zero.” a) What is less than, Alex? b) What is a cipher, Alex? c) What is oreth spelled backwards, Alex? d) What is the intensity of a constructive interference, Alex? e) What is the intensity of a complete destructive interference, Alex? 036 qmult 01000 1 1 1 easy memory: two-slit pattern 10. The two-slit interference pattern for visible light and for low orders typically appears as a) roughly evenly spaced bright and dark fringes. b) roughly evenly spaced bright and red fringes. c) fringes with the bright ones much narrower than the dark ones. d) Airy rings. e) a continuous spectrum. 036 qmult 01100 1 1 4 easy memory: two-slit formula 11. The formula for the maxima of a two-slit interference pattern (for slit separation of d ) is probably most easily remembered (maybe because it can be instantly derived) in the form: a) d sin θ = n ....
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