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  • In a sample of hydrogen like atoms all of which are in ground state, a photon beam containing photons of various energies is passed. In absorption spectrum, five dark lines are observed. The number

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

Option: 1

5


Option: 2

10


Option: 3

15


Option: 4

20


Answers (1)

best_answer

Five dark lines in absorption spectrum means the atoms had been excited to \mathrm{n=6}Consequently, in the emission spectrum, these are going to be \mathrm{\frac{6(6-1)}{2}=15}

Hence option 3 is correct.

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