JEE Main · 2021 · 17 Mar 2021 · Shift 2 · Modern Physics

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The atomic hydrogen emits a line spectrum consisting of various series. Which series of hydrogen atomic spectra is lying in the visible region?

(A)Paschen series
(B)Balmer series✓ Correct
(C)Lyman series
(D)Brackett series

Answer: (B)

Solution

Transitions ending on

n = 2

form the Balmer series; its first line,

n = 3 \to 2

, lies at 656 nm and the series limit at 365 nm, so the whole series falls in or at the edge of the visible band. Transitions ending on

n = 1

carry far more energy and make up the ultraviolet Lyman series, while those ending on

n = 3

and

n = 4

are the infrared Paschen and Brackett series. The visible lines of atomic hydrogen belong to the Balmer series.

JEE Main · 2021 · 17 Mar 2021 · Shift 2 · Single correct option

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