This is probably a silly question -- but I have been thinking about it, and I can't convince myself. So, I'd be greatly happy if you could solve my apparent "dilemma".(adsbygoogle = window.adsbygoogle || []).push({});

In electromagnetics, for sinusoidal voltages, we use the phasor notation and express aas follows:

positive travelling wave ( +Z direction)

[tex]E_+ = A_0 e^{-i \beta z }[/tex]

where as in quantum mechanics a positive travelling wave (+Z direction) is written as follows (correct me if I am wrong)

[tex] \Psi_+ = A_0 e^{+i \beta z} [/tex]

where beta's are wavenumbers.

Where am I messing this up?

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# Wave propagation, +z or -z

Can you offer guidance or do you also need help?

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