  In this paper we consider the solution of a black hole with a global monopole
in $f(R)$ gravity and apply the partial wave approach to compute the
differential scattering cross section and absorption cross section. We show
that in the low-frequency limit and at small angles the contribution to the
dominant term in the scattering/absorption cross section is modified by the
presence of the global monopole and the gravity modification. In such limit,
the absorption cross section shows to be proportional to the area of the event
horizon.
