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Energy of an electron is given by E=-2.7...

Energy of an electron is given by E=-2.718*10-18 J Wavelength of light required to excite an electron in a hydrogen atom from level n = 1 to n = 2 will be…

A

`1.214xx10^(-7)` m

B

`2.186xx10^(-7)` m

C

`6.500 xx10^(-7)` m

D

`8.500 xx10^(-7)` m

Text Solution

Verified by Experts

The correct Answer is:
A
`triangle =hv =(hc)/(lambda)=R_(H)(1)/(n_(i)^(2))-(1)/(n_(f)^(2))`
`=(6.26xx10^(-34)xx3xx10^(8))/(2.178xx10^(-18)(0.75))`
`=12.169xx10^(-8)`
`=12.169xx10^(-7)` m
`=1.214 xx10^(-7)` m
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