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An atom in an excited state of 4.4 eV emits a photon and ends up in...

An atom in an excited state of 4.4 eV emits a photon and ends up in the ground state. The lifetime of the excited state is 1.1 ✕ 10-13 s.

(a) What is the energy uncertainty of the emitted photon?
eV
(b) What is the spectral line width (in wavelength) of the photon?

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