Page No. Page No (Date : 1201 Quesy Electromagnetic Madiatione col wavelength 242 mm v is just sollicent D to ionise ! re so duen acom. Callblate the Tonization energy o sodium im KJ mot!

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Wavelergan ( lambda=242 mathrm{nm}=242 times 10^{-9} mathrm{m} ) Energy of Moton ( =frac{h C}{lambda}=frac{6.6 times 10^{-34} mathrm{Js} times 3.0 times 10^{circ}}{242 times 10^{-9} mathrm{m}} ) ( =0.0821 times 10^{-17} mathrm{Jatom}^{-1} ) This energy is sufficient to canse iomination of one atom of Na " Tonisation encegy in ( k J ) for I mole [ begin{array}{l} =0.0821 times 10^{-17} times 6.02 times 10^{23} =494 mathrm{kJ} mathrm{mol}^{-1} end{array} ]

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