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1.
The required energy to detach one electron from Balmer series of hydrogen spectrum is
2.
is the frequency of the series limit of Lyman series, 
is the frequency of the first line of Lyman series and 
is the frequency of the series limit of the Balmer series. Then
is the frequency of the series limit of Lyman series, is the frequency of the first line of Lyman series and is the frequency of the series limit of the Balmer series. Then
3.
The ionisation potential of mercury is 10.39 V. How far an electron must travel in an electric field of 
to gain sufficient energy to ionize mercury?
to gain sufficient energy to ionize mercury?
4.
Which of the following transition gives the photon of minimum frequency?
5.
If the binding energy of the electron in a hydrogen atom is 13.6 
, the energy required to remove the electron from the first excited state of 
is
, the energy required to remove the electron from the first excited state of is