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conantee
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« on: December 31, 2009, 01:32:28 PM »

27. The hypothesis that an electron possesses spin is qualitatively significant for the explanation of all of the following topics EXCEPT the
(A) structure of the periodic table
(B) specific heat of metals
(C) anomalous Zeeman effect
(D) deflection of a moving electron by a uniform magnetic field
(E) fine structure of atomic spectra
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« Reply #1 on: December 31, 2009, 01:41:45 PM »

Suppose you know nothing about quantum mechanics. You may still know electromagnetism. One phenomena which can be explained by just E&M is (D), the deflection of a moving electron by a uniform magnetic field. The magnetic (or Lorentz) force depends on charge, not spin of electron. (Well, after Stern-Gerlach experiment, we know that spin also contributes to the deflection, but we don't need spin in order to explain this phenomena).

The correct answer is (D). 39 of 100 people chooses the correct answer.

Physics behind it: (A) is clearly from the spin. Since spin gives another quantum number, it makes electrons in atoms fit as they are now. (B), (C) and (E) all comes from spin interaction. Like angular momentum, spin causes magnetic moment and interacts with others.
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