Quantum mechanics question on probability amplitude

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SUMMARY

The discussion centers on the necessity of using probability amplitudes in quantum mechanics, specifically addressing the phenomenon of wave superposition. It is established that the probability of an outcome is determined by the square of the modulus of the probability amplitude, denoted as |\psi(x)|^2. The example provided illustrates that the probability density function p(x) can be calculated for a particle's position, emphasizing that integrating the probability amplitude alone does not yield meaningful results. The conversation concludes that understanding wave superposition is crucial for grasping the role of probability amplitudes in quantum mechanics.

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Homework Statement



What physical phenomenon requires us to work with probability amplitudes rather than just
with probabilities, as in other fields of endeavour?

Homework Equations



The Attempt at a Solution



That the probability of an outcome is given by the square of the modulus of the corresponding probability amplitude? But that's not a physical phenomenon?
 
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Is probability a physical phenomenon? I don't think so, but maybe.
Like any statistical distribution you can use the density to e.g. finding the probability of the particle being a point in space:
Find the probability that the electron has position x = 2 given that:
p(x) = |\psi(x)|^2 = 1/x^2
Then you would be wrong to integrate, but simply doing this would solve it:
p(x=2) = 1/2^2 = 4
I don't think you can assign much meaning to the \psi(x) alone.
Hope that helped a little.
 
'Waves superposition' would be an answer.
 

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