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## Homework Statement

N surfactant molecules occupy an interface with A binding sites. The molecule has energy= -ε when perpendicular to the interface, and -δ when parallel to the interface (ε>δ>0). M is the number of surfactants perpendicular to the interface.

For a given value of M, determine the energy E(M) and the number of configurations [itex]\Gamma[/itex](M)

## Homework Equations

None that I know of...

## The Attempt at a Solution

I don't even know where to begin. Any advice or direction much appreciated.