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**SOLVED: Quantum mechanics - particle in a box**

## Homework Statement

We have a box with an electron in it and we know for sure that the electron is in the left half of the box. What is the probability that the electron is found in the ground state if we perform a measure on it?

## Homework Equations

## The Attempt at a Solution

A class mate told me that the probability is zero since it's impossible to measure/calculate the probability because the probability is time-dependent and the time-dependency is eliminated here.

Is that really true? And if it is, why is the time-dependency eliminated?

I'm totally lost here... don't even know where to begin looking for a correct answer so any hint is very appreciated.

Best regards,

Steve

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