$3.$ Oral absorption of nanoparticles typically follows first order kinetics, and kabs is smaller with larger nanoparticles.

a$.$ Explain why larger nanoparticles have smaller kabs $.$ Assume that barriers are the same to the differently sized nanoparticles. Hint: consider the Einstein$-$Stokes equation and your knowledge of scaling.

b$.$ Use your scaling relationship to determine the difference in kabs between a $30$nm and $120$ nm NP$.$