Particle in a box quantum mechanics

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The discussion focuses on the energy levels of a particle in a box in quantum mechanics, specifically addressing the relationship between energy and quantum number, where energy is proportional to the square of the quantum number (E ∝ n²). The participants analyze the equation for the relative uncertainty in energy, concluding that in the limit of large quantum numbers, the ratio ΔE/E approaches 2/n. There is a suggestion that option (a) is likely the correct answer, although there is some consideration for option (d) due to the vague phrasing of the question. Overall, the clarity of the problem statement is questioned, which may affect the interpretation of the answers. The discussion highlights the complexities involved in quantum mechanics problem-solving.
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Homework Statement


upload_2017-12-28_0-48-6.png


Homework Equations

The Attempt at a Solution



## E \propto n^2 ##

## \frac { \Delta E} E = \frac { 2n +1} {n^2} ##

In the limit of large quantum number, ## \frac { \Delta E} E = \frac { 2} {n} ##, option (a).
 

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Looks good.
 
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That is probably the answer they are looking for. Perhaps there is a case for d). The question is phrased very sloppily.
 
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Thanks.
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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