Uncertainty in particle position

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SUMMARY

The discussion centers on the calculation of particle position uncertainty, specifically addressing the incorrect assertion that the uncertainty, denoted as ##\Delta x##, is zero due to symmetry. The correct value for ##\Delta x## is established as ##0.18a##. Participants emphasize the need for clarity regarding symmetry arguments and the implications of assuming zero uncertainty without proper justification.

PREREQUISITES
  • Understanding of quantum mechanics principles, particularly uncertainty relations.
  • Familiarity with mathematical notation used in physics, such as integrals and variables like ##\Delta x##.
  • Knowledge of symmetry concepts in physics and their applications in problem-solving.
  • Basic proficiency in discussing and interpreting physics problems in a collaborative environment.
NEXT STEPS
  • Study the implications of the Heisenberg Uncertainty Principle in quantum mechanics.
  • Learn about symmetry arguments in physics and their role in simplifying complex problems.
  • Explore the mathematical derivation of uncertainty in particle position using integrals.
  • Review common mistakes in applying symmetry in physics problems to avoid similar errors.
USEFUL FOR

Students and educators in physics, particularly those focusing on quantum mechanics, as well as anyone interested in understanding the nuances of uncertainty calculations and symmetry in physical systems.

MaxJ
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Homework Statement
below
Relevant Equations
below
For this problem,
1723537877356.png

My solution is
1723537945310.png

1723537992107.png

1723538009333.png

However, the my answer for ##\Delta x## is not correct. The correct answer is ##\Delta x = 0.18a##. Does someone please know what I have done wrong?

Kind wishes
 
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MaxJ said:
what I have done wrong?
You have hand waved "zero by symmetry" where what you have waved away is not zero by symmetry. Why do you think it should be zero and what symmetry would there be?
 
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Orodruin said:
You have hand waved "zero by symmetry" where what you hade waved away is not zero by symmetry. Why do you think it should be zero and what symmetry would there be?
Be blessed Sir.

I have doubt what you mean in regards to symmetry. Can you explain some more?
 
MaxJ said:
Be blessed Sir.

I have doubt what you mean in regards to symmetry. Can you explain some more?
You were the one trying to invoke symmetry arguments so you should be able to tell me why you think the integral should be zero "due to symmetry".
 
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