28. monoenergetic electron beam displays in the center

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28. monoenergetic electron beam displays in the center of the cathode ray tube screen blur radius r ≈ 10-3 cm. Using the uncertainty relation, find how many times the uncertainty Δx electron coordinates on the screen in the direction perpendicular to the tube axis, smaller than the r spots. The length L of the cathode ray tube taken as equal to 0.50 m, and the accelerating voltage of the electron U - equal to 20 kV.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)


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