So, a state 0.5 eV above the Fermi level has a 1% chance of being occupied at approximately 1263 Kelvin
Find the temperature at which there is 1% probability that a state with an energy 0.5 eV above Fermi energy is occupied.
So, a state 0.5 eV above the Fermi level has a 1% chance of being occupied at approximately 1263 Kelvin