  In this work we have studied the scattering of scalar field around an
extended black hole in F(R) gravity using WKB method. We have obtained the wave
function in different regions such as near the horizon region, away from
horizon and far away from horizon and the absorption cross section are
calculated. We find that the absorption cross section is inversely proportional
to the cube of Hawking temperature. We have also evaluated the Hawking
temperature of the black hole via tunneling method.
