Q7 / 201 · NTA Abhyas (NEET) 2020 · Physics · Atomic Physics

The wavelength of light emitted from the second orbit to the first orbit in a hydrogen atom is

A
$6563 \overset{\circ}{A}$
B
$4102 \overset{\circ}{A}$
C
$4861 \overset{\circ}{A}$
Correct answer
D
$1215 \overset{\circ}{A}$

Solution

\frac{1}{λ} = R (\frac{1}{1^{2}} - \frac{1}{2^{2}})

\Rightarrow \frac{1}{λ} = 1.097 \times 10^{7} \times \frac{3}{4}

∴ λ = 1.215 \times 10^{- 7} m = 1215 \overset{\circ}{A}

Hence, the correct answer is option: 'D'.

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