1.

Energy of an electron is given by E= -2.178 xx 10^(-18)J ((z^(2))/(n^(2))). The wavelength of light required to excite an electron in a hydrogen atom from level n=1 to n=2 will be (h= 6.62 xx 10^(-34)Js, C= 3.0 xx 10^(8) ms^(-1))

Answer»

`1.214 XX 10^(-7)m`
`2.816 xx 10^(-7)m`
`6.560 xx 10^(-7)m`
`8.500 xx 10^(-7)m`

ANSWER :A


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