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Q. Laser light with a wavelength of 670 nm illuminates a pair of slits at normal incidence. What slit separation will produce first-order maxima at angles of plus or minus 35 degrees from the incident direction?

Q. A 45.0 kg girl is standing on a 133 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.33 m/s relative to the plank.

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