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Question

Electromagnetic radiation of wavelength 286 nm is just sufficient to ionise the sodium atom. Calculate the ionisation energy in kJ/mol.(Planck's constant (h) = 6.626×1034 Js)

A
418.8 kJ mol1
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B
209.4 kJ mol1
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C
41.8 kJ mol1
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D
814.2 kJ mol1
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