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Q. Coherent light with wavelength 601 passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3.00 from the slits. The first-order bright fringe is a distance of 4.84 from the center of the central bright fringe.For what wavelength of light will the first-order dark fringe be observed at this same point on the screen.

Q. A man pushes a lawn mower on a level lawn with a force of 186 N. If 45% of this force is directed downward, how much work is done by the man in pushing the mower 7.1 m?

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