When a narrow beam of monoenergetic electrons impinges on the surface of a single metal crystal...
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When a narrow beam of monoenergetic electrons impinges on the surface of a single metal crystal at an angle of 30 degrees with the plane of the surface, first-order reflection is observed. If the spacing of the reflecting crystal planes is know from x-rays measurements to be 3 Angstrom, the speed of the electron is most nearly 10 x 10-4 m/s A. 1.4 x B. 2.4 m/s C. 5.0 x 10³ m/s D. 2.4 x 106 m/s E. 4.5 x 10⁹ m/s When a narrow beam of monoenergetic electrons impinges on the surface of a single metal crystal at an angle of 30 degrees with the plane of the surface, first-order reflection is observed. If the spacing of the reflecting crystal planes is know from x-rays measurements to be 3 Angstrom, the speed of the electron is most nearly 10 x 10-4 m/s A. 1.4 x B. 2.4 m/s C. 5.0 x 10³ m/s D. 2.4 x 106 m/s E. 4.5 x 10⁹ m/s
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