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Calculate the longest wavelength which can remove the electron from `I^(st)` Bohr's orbit . Given `E_(1)=13.63eV`.

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The photon capable of removing electron from I Bhor's orbit must posses energy
`13.6eV`
`13.6xx1.602xx10^(-19)J` =`21.787xx10^(-19)J`
`E=(hc)/(lambda)`
`21.787xx10(-19)`=`6.662xx10^(-19)`=`(6.62xx10^(-34)xx3.0xx10^(8))/(lambda)`
`lambda`=`912.24xx10^(-10)m`=`912.24Å`
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