Question
The wavelength of the second line of Balmer series is 486.4 nm. What is the wavelength of the first line of Lyman series?

121.6 nm

364.8 nm

729.6 nm

None of these
medium
Solution
121.6 nm
Wavelengths in Balmer series for hydrogen are given by
The second line in Balmer series corresponds to n = 4. Hence
The wavelength of the first line (n = 2) in Lyman series is
.
121.6 nm.
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