The width of the central bright fringe in a diffraction pattern on a screen is identical when either electrons or optical light 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. If the wavelength of the optical light is 562 nm, how fast are the electrons moving?

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Blackbody

Q.5 A blackbody radiates how much energy when the temperature of the body is elevated?