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The electron energy in hydrogen atom is ...

The electron energy in hydrogen atom is given by `E_(n) = (-21.7 xx 10^(-12)/(n^(2))) erg`. Calculate the energy required to remove an electron completely from the `n = 2` orbit.What is the longest wavelength (in cm) of light can be used to cause this transition ?

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The correct Answer is:
`5.425 xx 10^(-12)erg`
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