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Q.

The ratio of wavelength of spectral lines $H_{α}$ and $H_{β}$ in the Balmer series is $\frac{x}{20}$ . The value
of $x$ is ___

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a

34

b

27

c

56

d

45

answer is A.

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Detailed Solution

detailed_solution_thumbnail

For H – atom

$\frac{1}{λ} = R [\frac{1}{{n_{1}}^{2}} - \frac{1}{{n_{2}}^{2}}]$

$n_{1} = 2 a n d n_{2} = 3 & 4$

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