Question: Visible light incident on a diffraction grating with slit spacing of 0.010 mm has the first maximum at an angle of 3.6 from the central

Visible light incident on a diffraction grating with slit spacing of 0.010 mm has the first maximum at an angle of 3.6° from the central peak. If electrons could be diffracted by the same grating, what electron velocity would produce the same diffraction pattern as the visible light?

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