CH01 Notes

# Question when we measure the particles position we

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Unformatted text preview: es “indeterminacy.” Question: When we measure the particle’s position, we got the result at . Where is the particle just before the measurement? 1. the realist position (Einstein, d’Espagnat): the particle was at measured position. 2. the orthodox position (Copenhagen interpretation): particle wasn’t really anywhere. 3. the agnostic position : refuse to answer Experiment will decide which is right position. 4 Jordan’s comment: “observation not only disturb what is to be measured, they produce it … We compel (the particle) to assume a definite position.” Copenhagen interpretation ( the most widely accepted) by Bell’s inequality (experimentable) Question) What if I made a second (same) measurement, immediately after the first? Same result. (interpreted as the collapse of wavefunction) 5 1.3 Probability 1.3.1 Discrete variables () () () ∑ with Average value of ∑ 〈〉 〈 ( )〉 () ∑ ∑ () () ∑( 〈 〉) ( ) 〈〉 Variance: ∑ () () 〈〉 Deviation from the average: 〈〉 () ∑ () 〈 〉∑ ( ) 〈〉 〈( ) 〉 Standar...
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