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Let be a photon whose wavelength ? = 6000 Å has been measured with relative uncertainty...

Let be a photon whose wavelength ? = 6000 Å has been measured with relative uncertainty (delta Ⲗ.)/ Ⲗ

What is the uncertainty about the position of this photon. If we consider that the photon has been emitted by an electron that has transited from an excited state to the ground state, what would it be the lifetime of this excited state.

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