3. A molecule in its first excited state will spontaneously decay to the ground state by emitting a photon. For two samples of two different molecules the lifetime, t, of this process is 11 ps and 3.5 ns. Calculate the minimum FWHM, I, of the resulting spectral lines of the two samples. Explain your answer in terms of the uncertainty principle.

3. A molecule in its first excited state will spontaneously decay to the ground state by emitting a photon. For two samples of two different molecules the lifetime, t, of this process is 11 ps and 3.5 ns. Calculate the minimum FWHM, I, of the resulting spectral lines of the two samples. Explain your answer in terms of the uncertainty principle.