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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)`.

A

`494.5 J mol^(-1)`

B

`494.5 kJ mol^(-1)`

C

`494.5 "cal" mol^(-1)`

D

`600.5 kJ mol^(-1)`

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The correct Answer is:
B
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