What is the wavelength of light for the least energetic photon emitted

What is the wavelength of light for the least energetic photon emitted in the Lyman series of the hydrogen spectrum. (take, hc=1240 eV-nm)

Options

(a) 122 nm
(b) 82 nm
(c) 150 nm
(d) 102 nm

Correct Answer:

122 nm

Explanation:

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