  The main purpose of this paper is to study quasinormal modes (QNM) of a black
hole in massive gravity with a positive cosmological constant due to
electromagnetic perturbations. A detailed study of the QNM frequencies for the
electromagnetic field is done by varying the parameters of the theory such as
the mass, scalar charge, cosmological constant, and the spherical harmonic
index. We have employed the sixth order WKB approximation to calculate the QNM
frequencies. The electromagnetic potential for the near extreme massive gravity
de Sitter black hole is approximated with the P$\ddot{o}$schl-Teller potential
to obtain exact frequencies. Our results show that the black hole is stable
under electromagnetic perturbations. The null geodesics of the black hole in
massive gravity is employed to describe the absorption cross sections at
high-frequency limit.
