Line Spectra from All Regions of the Electromagnetic Spectrum, Including

question 19

Multiple Choice

Line spectra from all regions of the electromagnetic spectrum, including the Paschen series of infrared lines for hydrogen, are used by astronomers to identify elements present in the atmospheres of stars. Calculate the wavelength of the photon emitted when the hydrogen atom undergoes a transition from n = 5 to n = 3. (R = 1.096776 × 10⁷ m^-1)

• A) 205.1 nm
• B) 384.6 nm
• C) 683.8 nm
• D) 1282 nm
• E) > 1500 nm

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