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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3as110

Use $R_{H} = 1.097 \times 1 0^{7} m^{- 1}$ . Hydrogen atoms are excited to $n = 3$ and then emit all possible lines. Select the correct statements.

ATwo of the emitted lines belong to the Balmer series
BThe shortest wavelength emitted is about $102.6 nm$
CThe longest wavelength emitted is about $656.3 nm$
DThree different lines are emitted

Answer: B, C, D

Lines:

3 \to 2

,

3 \to 1

,

2 \to 1

. Shortest is

3 \to 1

:

λ = 9/ (8 R_{H}) = 102.6 nm

. Longest is

3 \to 2

:

λ = 36/ (5 R_{H}) = 656.3 nm

. Only

3 \to 2

is Balmer, so 'two' is wrong.

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