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Q. A 35.0 g bullet moving at 475m/s strikes a 2.80 kg bag of flour that is on ice, at rest. The bullet passes through bag, leaving at 285 m/s. How fast is the bag moving when the bullet exits?

Q. Coherent light with wavelength 591nm passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3m from the slits. The first-order bright fringe is a distance of 4.84mm 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?

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