# Reviewing Griffith normalisation problem

#### hagopbul

Homework Statement
It is about normalisation I am posting the image of the question down below
Homework Equations
Integral { psi(X,t) = |psi(X,t)|^2 dx} from X=-inf to X= + inf

My problem is in (b) it written sketch psi (X,0) as function of X , why the answer was like this

I didn't understand the branch from a to b

Best

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#### TSny

Homework Helper
Gold Member
You are given that between $x = a$ and $x = b$ the wave function is

$\psi(x) = A \frac{b-x}{b-a}$

You should be able to tell that this is linear and has negative slope. What particular aspect of the graph is bothering you?

#### hagopbul

Thank you solve it just was problem with the rendering the graph made me confused for a moment