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Energy of an electron is given by E = - ...

Energy of an electron is given by `E = - 2.178 xx 10^-18 J ((Z^2)/(n^2))`. Wavelength of light required to excite an electron in an hydrogen atom from level `n = 1` to `n = 2` will be
`(h = 6.62 xx 10^-34 Js` and `c = 3.0 xx 10^8 ms^-1`).

A

`6.500xx10^(-7)m`

B

`8.500xx10^(-7)m`

C

`1.214xx10^(-7)m`

D

`2.816xx10^(-7)m`

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