The wavelength of the spectral line, for the transition n = 2 to n=1 in the hydrogen emission spectrum is .X.. Which of the following spectral line also has a wavelength of X

The wavelength of the spectral line, for the transition n = 2 to n=1 i

1.	The wavelength of the spectral line, for the transition n = 2 to n=1 in the hydrogen emission spectrum is .X.. Which of the following spectral line also has a wavelength of X
Answer» `.H_(ALPHA).`line in the Balmer series of SPECTRUM of .H. `.H_(beta).`line in the Balmer series of spectrum of .H. `.H_(alpha).`line in the Balmer series of spectrum of .He^(+). `.H_(beta).`line in the Balmer series of spectrum of .He^(+). SOLUTION :`bar(upsilon) = Z^2 R [1/(1^2) - 1/(2^2)] and lambda = 1/(bar(upsilon))` `""H ""He^(+)` `(1)^2 (1/((1)^2) - 1/((2)^2)) = (2)^2 ((1)/(n_1^2) - 1/(n_2^2))` on solving `n_1 = 2 , n_2 = 4`