# Homework Help: Radiation Force on a Classical Atom

1. Mar 10, 2013

### Kyung Wan

1. The problem statement, all variables and given/known data

Show that the integral under this absorption cross section,σ, from a de-tuning of -∞ to +∞ is independent of the line width of the resonance,$\gamma$

2. Relevant equations

I have posted an attachment with the picture of the formula. I was having some difficulties with the quick symbol/symbols.

3. The attempt at a solution

Well, it said take the integral from -infinity to +infinity so that is what did. I took the variable to be ∫σ dω

Is this the correct way to show that σ is independent of $\gamma$

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