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Using Bohr's model , calculate the wavel...

Using Bohr's model , calculate the wavelength of the radiation emitted when an electron in a hydrogen atom makes a transition from the fourth energy level to the second energy level.

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`barv = 1/lambda = 109678(1/(n_1^2) - 1/(n_2^2)) cm^(-1)`
Here `n_1 = 2, n_2 = 4`
`:. barv = 1/lambda = 109678 (1/(2^2) - 1/(4^2)) cm^(-1)`
`=109678 xx 12/16 cm^(-1) = 8.2 xx 10^(4) cm^(-1)`
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