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Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom . Calculate the ionisation energy of sodium in kJ `mol^(-1)`.

A

`494.5`

B

`594.5`

C

`694.5`

D

`794.5`

Text Solution

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The correct Answer is:
A
`E = (hc) = E xx N_(A)`
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