Question: Visible light incident on a diffraction grating with slit spacing of 0.010 mm has the first maximum at an angle of 3.5o 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 3.5o 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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