Question
Sat June 11, 2011 By:

the first line of balmer series of He ion has a wavelength of 164 nm. the wavelength of the series limit is?

Expert Reply
Mon June 13, 2011
Ans. (d)
 According to Rydberg equation,
 For    first   line in Balmer series, n1 =2  n2=3
zTherefore     1/ 164       =  RH{1/22-1/32}
  For  the series limit  
 
 Dividing equation (1) by  (2)
?/164 =5 X4 /36
          =91.2
 
The wavelength of the series limit is 91.2
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