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In a sample of hydrogen-like atoms all of which are in the ground state, a photon beam containing photons of various energies is passed. In the absorption spectrum, five dark lines are observed. The number of bright lines in the emission spectrum will be (Assume that all transitions take place)

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Solution

Absorption spectrum is observed when a photon is observed and a electron
Jumps to a higher state. Controversy emission spectrum is observed when
electron comes to lower state emitting a photon
On considering all possible transition states, thus no. of observation
and emission lines will be same.

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