1.

The Balmer series for the H-atom can be observed ...

Answer»

if we measure the FREQUENCIES of light emitted when an excited atom falls to the ground state.
if we measure the frequencies of ligh emitted due to transitions between excite states and the FIRST excited state.
in any transition in a H-atom.
as a sequence of frequencies with the highe frequencies getting closely packed.

Solution :According to formula`(1)/(labda)=R((1)/(2^(2))-(1)/(n^(2)))` where `R=1.097xx10^(7)m^(-1)`= Rydberg.s constant), wher electron makes transition from `n = 3, 4, 5, 6, .. . oo "to" n = 2` corresponding spectral lines form Balmer SERIES of ATOMIC spectrum of hydrogen Here spectral lines are found to be arranged closer and closer.
`rArr` THUS, options (B) and (D) are correct.


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