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Q. A double-slit experiment is set up using red light (l = 709 nm). A first order bright fringe is seen at a given location on a screen. What wavelength of visible light (between 380 nm and 750 nm) would produce a dark fringe at the identical location on the screen?

Q. If a car traveling at 66 km/h will skid 22 m when its brakes lock, how far will it skid if it is traveling at 120 km/h when its brakes lock?

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