How many photons have been emitted

Reference no: EM13272780

2.30×106 atoms are excited to an upper energy level at t=0s. At the end of 10.0ns, 80.0% of these atoms have undergone a quantum jump to the ground state.

A) How many photons have been emitted?

B) What is the lifetime of the excited state?

Reference no: EM13272780

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