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03-10-2017
Physics

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i do not know why but the answer is 684 please let me know why. A light with a second-order dark band forms a diffraction angle of 20.0°. The diffraction grating has 200.0 lines per mm.
The wavelength of the light, to the nearest whole number, is nm.

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03-10-2017

I don't get what your asking I'm sorry the question isn't clear

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