Which one of the following statements for the emission spectrum of hydrogen is true?
[amp_mcq option1=”The Lyman series lies in the visible region and the Paschen series lies in the infrared region.” option2=”The Lyman series lies in the ultraviolet region and the Paschen series lies in the infrared region.” option3=”Both the Lyman and the Paschen series lie in the visible region.” option4=”The Lyman series lies in the ultraviolet region and the Paschen series lies in the visible region.” correct=”option2″]
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UPSC Geoscientist – 2023
– Lyman series: n_final = 1. Transitions from n_initial = 2, 3, 4,… to n=1. These transitions involve the largest energy drops and thus result in the emission of high-energy photons, which fall in the ultraviolet (UV) region of the electromagnetic spectrum.
– Balmer series: n_final = 2. Transitions from n_initial = 3, 4, 5,… to n=2. These transitions correspond to visible light.
– Paschen series: n_final = 3. Transitions from n_initial = 4, 5, 6,… to n=3. These transitions involve smaller energy drops than Balmer series and fall in the infrared (IR) region of the electromagnetic spectrum.
– Brackett series: n_final = 4. Transitions from n_initial = 5, 6, 7,… to n=4. These are in the far-infrared region.
– Pfund series: n_final = 5. Transitions from n_initial = 6, 7, 8,… to n=5. These are also in the far-infrared region.
The statement that is true is that the Lyman series lies in the ultraviolet region and the Paschen series lies in the infrared region.