Hydrogen atom is bombarded with electrons accelerated through a potential different of 
, which causes excitation of hydrogen atoms. If the experiment is being formed at 
. The minimum potential difference needed to observe any Balmer series lines in the emission spectra will be 
, where 
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Text Solution
Verified by ExpertsCHECK THE SOLUTION.
(121)
For minimum potential difference electron has to make transition from 
to 
state but first electron has to reach to 
state from ground state. So, energy of bombarding electron should be equal to energy difference of 
and 
state.
So, 
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