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Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. What is the ionisation energy of sodium per atom?

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A, D
`E=(hc)/lambda=(6.62xx10^(-34)jsxx10^(8) ms^(-1))/(242 "nm" xx10^(-9)mJ "atom"^(-1))`
`E = (hc)/(lambda) = (6.62 xx 10^(-34) J s xx 10^(8) m s^(-1))/(424 nm xx 10^(-9) "m j atom" ^(-1))`
`= 494 kJ mol^(-1)`
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