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InterviewSolution
| 1. |
How does uncertainty relation accountfor natural width of spectral lines? |
| Answer» <p>Uncertainty principle: Energy level above ground state with energy E and lifetime Δt, has uncertainty in energy:</p><p>ΔEΔt ~h/2π</p><p>i.e. short-lived states have large uncertainties in the energy. </p><p>• A photon emitted in a transition from thislevel to the ground state will have a range of possible frequencies:</p><p>Δυ=1/(2πΔt) which account for the natural line width of spectral lines. </p> | |