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Electrons in a certain laser make transitions from a metastable state to the ground state. Initially there are 6 × 1020 atoms in the metastable state and 2 × 1020 atoms in the ground state. The number of photons that can be produced in a single burst is about:

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Electrons in a certain laser make transitions from a metastable state to the ground state. Initially there are 6 × 1020 atoms in the metastable state and 2 × 1020 atoms in the ground state. The number of photons that can be produced in a single burst is about:






 
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