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An Electromagnetic radiation of wavelength `242` nm is just sufficient to ionise a sodium atom .Calculate the ionisation energy of sodium in `KJ mol^(

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An Electromagnetic radiation of wavelength `242` nm is just sufficient to ionise a sodium atom .Calculate the ionisation energy of sodium in `KJ mol^(-1)`.
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`E = (hc)/(lambda) = (6.625 xx 10^(-34) J s xx 3 xx 10^(8) ms^(-1))/(242 xx 10^(-9) m)`
`8.214 xx 10^(-19) J`
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