In a sample of hydrogen like atoms all of which are in ground state, a photon beam containing photos of various energies is pass

In a sample of hydrogen like atoms all of which are in ground state, a photon beam containing photos of various energies is passed. In absorption spectrum, five dark line are observed. The number of bright lines in the emission spectrum will be (assume that all transitions take place)
A. `21`
B. `10`
C. `15`
D. `12`

In a sample of hydrogen like atoms all of which are in ground state, a photon beam containing photos of various energies is passed. In absorption spec

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