Visible light is incident perpendicular to a grating with 430 rulings/mm. What is the longest wavelength that can be seen in the fourth-order (n = 4) diffraction pattern? Express your answer to the nearest nm.

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Q: Why do we define covariant and contravariant vectors?

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Q: 4- Solve the differential equation: dv eε m +―v=eε dt VF

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Q: The vectors A= 3ax -2ay + 5az, B=4ax-6 ay + 2az, C=4ax-6ay-9az the result of C. (A- ,B) is

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