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The width of the central bright fringe in a diffraction pattern on a screen is identical when either electrons or blue light (vacuum wavelength = 465...

The width of the central bright fringe in a diffraction pattern on a screen is identical when either electrons or blue light (vacuum wavelength = 465 nm) pass through a single slit. The distance between the screen and the slit is the same in each case and is large compared to the slit width. How fast are the electrons moving?

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