Solve Complex Exponentials: |psi|e^iθ from psi = Ae^i(kz-wt) + Be^-i(kz+wt)

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SUMMARY

The discussion centers on the mathematical transformation of the wave function psi = Ae^i(kz-wt) + Be^-i(kz+wt) into the form psi = |psi| e^iθ. Participants emphasize the importance of accurately calculating |psi|, which is not simply |A+B|. Instead, the correct approach involves determining the magnitude of the complex wave function, which requires the use of the modulus of the individual components A and B. This foundational step is crucial for deriving the phase θ correctly.

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Homework Statement



Ok So I'm doing some quantum questions and i have:

psi = Ae^i(kz-wt) + Be^-i(kz+wt).

How can i write this as a single exponential in the form psi = |psi| e^ i theta?

Thanks!

Homework Equations





The Attempt at a Solution



Not sure really..

I guess |psi| = |A+B| ?

how do i get an expression for e^itheta?
 
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bon said:
I guess |psi| = |A+B| ?

This is incorrect. The first place to start would be properly computing |psi|.
 

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