Q.

The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are

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a

Paschen and Pfund

b

Lyman and Paschen

c

Brackett and Pfund

d

Balmer and Brackett

answer is B.

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Detailed Solution

1λ2=RH1n12−1n22Z21λ1=RH1m12−1m22Z2∴λ1λ2=91=m12n12
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The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are