When a black hole consumes matter, it can form an accretion disc. Is there a relationship between the mass of the falling matter $m$, the mass of the black hole $M$, and the energy radiated during the process (until all mass is consumed)? On what other factors the amount of radiated energy depends?
We can never know it by any kind of experiment . because not a photon,which is the smallest particle carrying energy is able to escape black hole then how are we gonna get to know it But we might be able to get it by the electromagnetic wave detection