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In this paper we have studied the propagation of a massless scalar fieldminimally coupled to a black hole with the source of cloud of strings in $2+1$$f(R)$gravity theory. In particular we have found analytical results for thedecay rate, reflection coefficient, greybody factors, as well as the black holetemperature. On the other hand, our quasinormal modes analyses revealsstability in the propagation of a massless scalar field in the cloud of stringsblack hole spacetime. However, under a suitable choose of parameters aninstability is found. Furthermore based on the Bekenstein conjecture on thequantization of the surface area of the black hole we find the minimal surfacearea associated to the black hole horizon which is in agreement withBekenstein's proposal.

Quasinormal Modes and Greybody Factors of $f(R)$ gravity minimally coupled to a cloud of strings in $2+1$ Dimensions