The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about . The spectral series are :
Lymen and Paschen
Balmer and Brackett
Brackett and Pfund
Paschen and Pfund
for shortest wavelength
For Lymen =
Balmer=
Paschen=
Brackett=
Pfund=
Lymen and Paschen
Option 2)Balmer and Brackett
Option 3)Brackett and Pfund
Option 4)Paschen and Pfund
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