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news_041411

news_041411 - Stuff for Thursday PS#5 due up front PS#4...

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Stuff for Thursday, April 14, 2011 PS #5 due up front; PS #4 returned. Erratum: The final answer to Q3R.1 should be 3 . 9 × 10 17 m 40 light-years; the rest is correct. Quiz tomorrow. Anything from the 1094 session is fair game, so please go through the answer key. 1094 Session 3 is returned up front (key is online). Common error: forgetting that | z | 2 = z * z and not z 2 . Be careful not to mix up eigenvalues and the coefficients of eigenvectors. An eigenvector does not have to be an energy eigenvector. Consider a magnetic field in the + x direction. In that case, only | + x i and | - x i are energy eigenvectors; the others (e.g., | + z i and | - y i ) are eigenvectors for spin-projection on the z -axis and y -axis but do not have definite energy. Probability: square wave function ψ ( x ) first, then add area. Time dependence is important! (We’ll review it today.) Quick warm-ups: | 1 + 2 i | 2 ? = | 1 - 2 i | 2 ? = |- i + 2 | 2 ? = Stages of learning quantum mechanics: Anger, denial, acceptance.

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Six Rules that Quantons Live By 1 State vector | ψ i describes quanton state. Normalized: h ψ | ψ i = 1. | ψ i = ψ 1 ψ 2 . . . h ψ | = ψ * 1 ψ * 2 . . . h ψ | ψ i = ψ * 1 ψ * 2 . . .
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news_041411 - Stuff for Thursday PS#5 due up front PS#4...

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