Question # The frequency of first line of Baimer series in hydrogen atom is vo. The frequency of corresponding line emitted by singly ionised helium atoms is :-

# The frequency of first line of Baimer series in hydrogen atom is vo. The frequency of corresponding line emitted by singly ionised helium atoms is :-

(1) ( 2 v_{0} )

(2) ( 4 v_{0} )

(3) ( v_{0} / 2 )

(4) ( v_{0} / 4 )

Solution

frequency ( alpha n^{2} )

hydrogen [begin{array}{l}text f=v_{0}

therefore text { for helium } f=4 v_{0}

text { (2) option }

end{array}

]