Absorption Spectrum Practice problem

[Sulfone]

Summary: The experimentally measured absorption spectrum of 1,3-pentadiene molecule exhibits a
peak absorption (light absorption) around 224 nm corresponding to an electronic
transition. Estimate the length of the molecule.

I thought of using lambert law A = c*l*e but we have none. how do I solve this

 

[DrClaude]

This has nothing to do with Lambert's law. What else have you seen that could link the absorption wavelength to the size of the molecule?