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## Homework Statement

Show that if we consider photoemission from the 1s state of a charge Z atom,

[tex]

\sigma \propto Z^5}}

[/tex], in the limit [tex] p_fa_0/Z\hbar >> 1.

[/tex]

## Homework Equations

[tex]

\sigma = \frac{128a_0^3\pi e^2p_f^3}{3m\hbar^3\omegac[1+p_f^2a_0^2/\hbar^2]^4}}

[/tex]

## The Attempt at a Solution

Actually I know how to do this. [tex] a_0 -> a_0/Z [/tex]. My question is why is this so? What is the physical interpretation/what does it mean?

jsc