A light bulbs operate at a temperature of 2500 C when bright and 2200 C when dim.
The creep rate of the filament when bright is 1.
5 times that when dim.
Assuming that the activation energy is constant within this temperature range, and that a single creep diffusion mechanism operates, calculate the activation energy in kJ/mol.
You can assume that the stress is the same when the light is bright or dim.
Q (in kJ/mol)