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**Quantum -- Find the formal expression of the coefficient cn(t=o)**

Hello everyone,

I'm really stuck on the first question of an exercise, so I can't start!!

## Homework Statement

ψ(x,t) a wave function normalized and solution of Shrodinger equation for a given potential.

I the eigenfunctions are given by the ∅n(x) (supposed to be a phi) with eigen values En so we can write ψ(x,t) as:

ψ(x,t)=Ʃ c

_{n}(t)∅n(x) = Ʃ c

_{n}(t=0)e^(-i*En*t/

__h__)∅n(x)

a. Find the formal expression of the coefficient cn(t=o) in terms of ∅n(x), and show the maths of your result by using the orthogonality of ∅n(x).

## Homework Equations

## The Attempt at a Solution

Nothing, sadly.

Thanks !!!!!