What Are the Key Questions About Quantum Mechanics Fundamentals?

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SUMMARY

The discussion focuses on fundamental questions regarding quantum mechanics, specifically the differences between the ordinary wave equation and the Schrödinger equation, the dimensionality of wavefunctions, and the continuity of derivatives of wavefunctions. The Schrödinger equation connects first-order time derivatives with second-order spatial derivatives, which is essential for defining wavefunctions independent of particle properties. The wavefunction has dimensions of L-3/2, making direct measurement challenging due to the probabilistic nature of quantum mechanics. Additionally, continuity in wavefunctions implies continuity in their spatial derivatives, which is crucial for understanding quantum behavior.

PREREQUISITES
  • Understanding of Schrödinger equation fundamentals
  • Knowledge of wavefunction dimensional analysis
  • Familiarity with concepts of continuity in mathematical functions
  • Basic principles of quantum mechanics measurement theory
NEXT STEPS
  • Study the implications of the Schrödinger equation in quantum mechanics
  • Research the dimensional analysis of wavefunctions in quantum systems
  • Learn about the continuity requirements for wavefunctions and their derivatives
  • Explore measurement theory in quantum mechanics and its effects on wavefunctions
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Students of quantum mechanics, physicists, and anyone seeking a deeper understanding of the foundational principles of quantum theory.

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Homework Statement



I've some doubts in the basic quantum mechanics.I know these are too simple. But can't figure out the exact answer.


1. Ordinary wave equation relates second order time derivative to second order space derivative.But Schrödinger equation connects first order time derivative with second order space derivative.Why this difference?

2. I've seen in a book that wavefunction should have a dimension of L-3/2(because |ψ|2dx should be dimensionless).Then why can't we measure wavefunction?

3.From Schrödinger equation, ψ should be continuous.But how can we say that ∂ψ/∂x should be continuous also?


The Attempt at a Solution



1. A book says this is to make wave function independent of the properties of the particle(if wave function for free particle is considered).But i can't understand it properly.

3.I think (may be wrong) when ψ is a continuous function of x, ∂ψ/∂t should be a continuos function of x. ie, LHS of Sch. equation is continous. Then RHS also need to be continuous. But it don't imply that ∂ψ/∂x should be continuous.
 
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In regards to 2, think about what happens when you measure something in quantum mechanics, how would this make it hard for you to measure the wavefunction?
 

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