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1040_Physics ProblemsTechnical Physics

1040_Physics ProblemsTechnical Physics - 37 Interference of...

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37 CHAPTER OUTLINE 37.1 Conditions for Interference 37.2 Young’s Double-Slit Experiment 37.3 Intensity Distribution of the Double-Slit Interference Pattern 37.4 Phasor Addition of Waves 37.5 Change of Phase Due to Reflection 37.6 Interference in Thin Films 37.7 The Michelson Interferometer Interference of Light Waves ANSWERS TO QUESTIONS Q37.1 (a) Two waves interfere constructively if their path difference is zero, or an integral multiple of the wavelength, according to δ λ = m , with m = 0 1 2 3 , , , , . (b) Two waves interfere destructively if their path difference is a half wavelength, or an odd multiple of λ 2 , described by δ λ = + F H G I K J m 1 2 , with m = 0 1 2 3 , , , , . Q37.2 The light from the flashlights consists of many different wavelengths (that’s why it’s white) with random time differences between the light waves. There is no coherence between the two sources. The light from the two flashlights does not maintain a constant phase relationship over time.
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