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Energy of an electron is given by E=-2...

Energy of an electron is given by
`E=-2.178'10^(-18)J`
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

`1.214 xx 10^(-7)m`

B

`2.816 xx 10^(-7)m`

C

`6.500 xx 10^(-7)m`

D

`8.500 xx 10^(-7)m`

Text Solution

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The correct Answer is:
A
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Energy of an electron is givem by E = - 2.178 xx 10^-18 J ((Z^2)/(n^2)) . Wavelength of light required to excited 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 ).

Energy of electron is given by E=-2.178xx10^(-18)((Z^(2))/(n^(2))) J. Wavelength of light required to excited an electron in an hydrogen atom from level n=1 to n=2 will be (h=6.62xx10^(-34)J*s and c=3.0xx10^(8)m*s^(-1)) -

Energy of an electron in an excited hydrogen atom is -3.4eV . Its angualr momentum will be: h = 6.626 xx 10^(-34) J-s .

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For given enegy, corresponding wavelength will be E = 3.03 xx 10^(-19) Joules (h = 6.6 xx 10^(-34) j X sec., C = 3 xx 10^(8) m/sec

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