- #1

spaghetti3451

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## Homework Statement

Define measurement in the Copenhagen interpretation of quantum mechanics.

## Homework Equations

## The Attempt at a Solution

In the Copenhagen interpretation of quantum mechanics, measurement changes the state of a wavefunction, that is, it collapses the wavefunction into one its orthonormal basis vectors (eigenstates). We cannot assume that the system possesses properties if not measured...

I found the second sentence in a book of mine. Problem is I don't know what it means :-)

What do you think it means?