A parallel beam of light from a he-ne laser with wavelength, Ask an Expert

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Q. A parallel beam of light from a He-Ne laser, with a wavelength of 644 nm, falls on two very narrow slits 0.050 mm apart. How far apart are the fringes in the center of the pattern on a screen 2.2 m away?

Q. A car traveling at 33m/s runs out of gas while traveling up a 9.0 degree slope. How far will it coast before starting to roll back down?

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