First slide

Bohr's atom model

Question

In a hydrogen atom, the transition takes place from n = 3 to n = 2. If Rydberg's constant is $1.09 \times 10^{7} m^{- 1}$ , the wavelength of the line emitted is

Moderate

A

6606 $Å$
B

4861 $Å$
C

4340 $Å$
D

4101 $Å$

Solution

$\frac{1}{λ} = 1.09 \times 10^{7} [\frac{1}{2^{2}} - \frac{1}{3^{2}}] \Rightarrow λ = 6.606 \times 10^{- 7} m \Rightarrow 6606 Å$

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