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Quantum Mechanics

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1. What is meant by an expectation value?

2. What does it mean when we say that 'mod Psi-square' is a 'probability density', as opposed to a probability?

3. What is the difference between an operator that operates on an eigen function and one that operates on any function?

4. What is meant when we say that two operators either commute or do not commute?

5. What is Quantum Mechanical Tunneling?

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