What is the ratio of wavelength of radia...

What is the ratio of wavelength of radiations emitted when an electron in hydrogen atom jump from fourth orbit to second ornti and from third orbit to second orbit?

`27:25`

`20:25`

`25:17`

`20:27`

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The correct Answer is:

`1/lamda_1 = R_H [1/2^2 - 1/4^2] = R_H xx 3/16`
`1/lamda_2 = R_H [ 1/2^2 - 1/3^2 ] = R_H = 5/36`
`therefore lamda_1/lamda_2 = 5/36 xx16/3 = 20/27`

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