A nucleus in an excited state will return to its ground

A nucleus in an excited state will return to its ground state, emitting a gamma ray in the process. If its mean lifetime in a particular exited state is about 6.35×10-12 s, what is the uncertainty in the energy of the corresponding gamma ray photon?And, what is the uncertainty in the frequency of the gamma ray?Consider an electron constrained to travel in a ‘1-dimensional box’ of length 4.510×10-9 m. (Click here for more information on a particle in a box.) What is the energy of electron for the n=4 state?What is the wavelength of the photon emitted if the electron drops from the third excited state (n=4) to the ground state (n=1)?

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