- #1

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## Main Question or Discussion Point

What is physically meant by:

[tex]\frac{d \sigma}{d \Omega}[/tex]

Where [tex]\sigma[/tex] is the cross section and [tex]\Omega[/tex] is solid angle.

I can't really picture it.

[tex]\frac{d \sigma}{d \Omega}[/tex]

Where [tex]\sigma[/tex] is the cross section and [tex]\Omega[/tex] is solid angle.

I can't really picture it.