1177_Physics ProblemsTechnical Physics

1177_Physics ProblemsTechnical Physics - 518 Q42.25 Atomic...

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518 Atomic Physics Q42.25 (a) The terms “I define” and “this part of the universe” seem vague, in contrast to the precision of the rest of the statement. But the statement is true in the sense of being experimentally verifiable. The way to test the orientation of the magnetic moment of an electron is to apply a magnetic field to it. When that is done for any electron, it has precisely a 50% chance of being either spin-up or spin-down. Its spin magnetic moment vector must make one of two allowed angles with the applied magnetic field. They are given by cos θ == S S z 12 32 and cos = . You can calculate as many digits of the two angles allowed by “space quantization” as you wish. (b) This statement may be true. There is no reason to suppose that an ant can comprehend the cosmos, and no reason to suppose that a human can comprehend all of it. Our experience with macroscopic objects does not prepare us to understand quantum particles. On the other hand, what seems strange to us now may be the common knowledge of tomorrow.
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