What is the Parity of a System Described by a Wavefunction?

[humanist rho]

Homework Statement

The wavefunction describing state of a system is,
$$\psi (r,\theta ,\phi )=\frac{1}{8\sqrt{\pi }}\left( \frac{1}{a_{0}}%<br /> \right) ^{3/2}\frac{r}{a_{0}}e^{-4/2a_{0}}\sin \theta e^{-i\phi }$$
Find the parity of system in this state.

The Attempt at a Solution

$$\psi (-r,\theta ,\phi )=\frac{1}{8\sqrt{\pi }}\left( \frac{1}{a_{0}}%<br /> \right) ^{3/2}\frac{-r}{a_{0}}e^{-4/2a_{0}}\sin \theta e^{-i\phi }<br /> =-\psi (r,\theta ,\phi )$$
odd parity.


I'm wrong.But donno where. Pls help.

 

[vela]

In spherical coordinates, the parity operator takes
\begin{align*}
r &\to r \\
\theta &\to \pi-\theta \\
\phi &\to \phi+\pi
\end{align*}

 

[humanist rho]

you mean r →-r ?

Then that gives me the perfect answer.
Thank you very much dear friend.

 

[vela]

No, r goes to +r.

 

[humanist rho]

How is that possible?
is it bcz r^2 = x^2+y^2+z^2?
But the reflection changes direction of vector also na?

Can you please explain?

 

[vela]

But the reflection changes direction of vector also na?

What?