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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.

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why ∆v∆t=1 is equal 1, not reduced h/2 ?

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