Hydrogen atom expectation of r^2 check

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SUMMARY

The discussion centers on calculating the expectation value of for a hydrogen atom with quantum numbers n=2, l=1, and m=0. The initial calculation provided by the user is 0.75 * a^2, where 'a' represents the Bohr radius. However, the user expresses doubt about the accuracy of this result, suggesting that a larger value may be correct. Participants are encouraged to share their calculations to verify the result.

PREREQUISITES
  • Understanding of quantum mechanics principles, specifically hydrogen atom models.
  • Familiarity with quantum numbers (n, l, m) and their significance.
  • Knowledge of the Bohr radius and its application in atomic physics.
  • Ability to perform expectation value calculations in quantum mechanics.
NEXT STEPS
  • Review the derivation of the expectation value for hydrogen-like atoms.
  • Study the implications of quantum numbers on atomic properties.
  • Learn about the mathematical techniques used in quantum mechanics, such as integration in spherical coordinates.
  • Explore the differences between classical and quantum mechanical models of the hydrogen atom.
USEFUL FOR

Students of quantum mechanics, physicists working on atomic models, and educators teaching advanced physics concepts will benefit from this discussion.

keith river
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I haven't posted any of my working for this as I only want to check my answer.

Q. For a hydrogen atom with n=2, l=1, m=0
calculate <r^2>

My answer = 0.75 * a^2

where a is the bhor radius.

Am I right?
 
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I don't think that's correct; I get a much larger answer. Can you show your work?
 

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