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asked in NEET by (2k points)
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 emissions  spectrum  will be

A) 5

B)10

C) 15

D) none

1 Answer

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answered by (82.7k points)

Sigma of n-1 n= 6 

since 5 dark lines 

so Sigma of r-1 

where r goes to 6 

=>15

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