PHYS 1260 Exam 4 | Question With Correctly Explained Answers.

PHYS 1260 Exam 4 | Question With Correctly Explained Answers. Superposition and Interference - Correct Answer - same wave + same wave = reinforcement - two opposite waves = cancellation - two similar waves = partial cancellation - interference patterns of overlapping waves from 2 vibrating sources - interference pattern = caused by interference b/w a pair of waves - constructive interference produces bright region where waves reinforce each other (waves arriving in phase) - destructive interference produces dark region where waves cancel each other (waves arriving half a wavelength out of phase) - a monochromatic light into double slits produces an interference pattern - the phenomenon of interference occurs for = sound waves + light waves -- interference is the property that characterizes waves in general Superposition and Interference part 2 - Correct Answer - single-color thin-film interference = reflection from the upper and lower surfaces of a wedge of air b/w 2 glass plates - interference colors by reflection from thin films = the thin film of gasoline is just the right thickness to result in the destructive interference of blue light - diffraction grating = composed of a large number of close, equally spaced slits for analyzing light source; produced by spectrometers that disperse white light into colors - if the thin film of gasoline was a bit thinner, the wavelength to be canceled would be = shorter than that of blue - if violet light were canceled by the double reflection of sunlight from gasoline on a wet surface, the resulting color would likely be = orange -- orange is the complementary color of violet - if you see the color blue reflected in the interference from gasoline on water, and you lower your head so a greater angle from the normal results, you'll likely see a color having a wavelength = shorter than that of blue -- the path through the gasoline would be longer, and a longer wavelength would be canceled; the result of a long wave being canceled is a shorter wave