Compute all parts of given question:
Question: An atom in an excited state 4.02 eV above the ground state remains in that excited state 2.50 ?s before moving to the ground state.
Part A: Find the frequency of the emitted photon.
Part B: Find the wavelength of the emitted photon.
Part C: Find the approximate uncertainty in energy of the photon.
I need help to find the approximate uncertainty in energy of the photon.