Proving time independence of energy eigenstates

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SUMMARY

The discussion centers on finding the probability density of the wave function psi(x,t) in quantum mechanics. The wave function is given by psi = sqrt(2/L)sin(n*pi*x / L)e^(-2*pi*i(E/h)t). The key insight is that to obtain the probability density, one must multiply the wave function by its complex conjugate, which effectively eliminates the exponential term. This method is crucial for correctly calculating the probability density associated with energy eigenstates.

PREREQUISITES
  • Understanding of quantum mechanics concepts, specifically wave functions
  • Familiarity with complex numbers and their conjugates
  • Knowledge of probability density in quantum mechanics
  • Basic grasp of trigonometric functions and their applications in physics
NEXT STEPS
  • Study the derivation of probability density from wave functions in quantum mechanics
  • Learn about the role of complex conjugates in quantum mechanics
  • Explore the implications of energy eigenstates in quantum systems
  • Investigate the mathematical properties of exponential functions in wave functions
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Students and educators in quantum mechanics, particularly those focusing on wave functions and probability densities, as well as anyone seeking to deepen their understanding of energy eigenstates.

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Homework Statement


We are ask to find the probability density of psi(x,t). I know that psi have an exp term but i don't understand how by squaring psi make the exp term disappear.


Homework Equations


Psi = sqrt(2/L)sin(n*pi*x / L)e^(-2*pi* i(E/h)t



The Attempt at a Solution


I attempted changing the exp term into polar coord but I can't seem to get anywhere with that.
 
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You don't square psi. You multiply it by it's complex conjugate. Makes all the difference.
 
Yes, I just read my text and I discover you are suppose to multiple the complex conjugate. Thank you.
 

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