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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3as103

A large sample of hydrogen atoms is excited to the $n = 4$ level and all possible downward transitions occur. Select the correct statements.

AThe line of longest wavelength is the $n = 4 \to n = 3$ transition
BTwo of the lines belong to the Balmer series
CA total of 6 different lines can be emitted
DFour of the lines belong to the Lyman series

Answer: A, B, C

Total lines

= 4 \times 3/2 = 6

: Lyman

4 \to 1, 3 \to 1, 2 \to 1

(three, so the Lyman statement is wrong), Balmer

4 \to 2, 3 \to 2

(two), Paschen

4 \to 3

(one). The

4 \to 3

gap,

7/144

in units of

R_{H}

, is the smallest, so it has the longest wavelength.

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