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A metallic surface when illuminated with light of wavelength 3333 Å emits electrons with energies upto 0.6 eV. Calculate the work function of the metal. Data : lambda=3333 Å, K.E=0.6eV, W=? |
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Answer» SOLUTION :Work function, W = hv - kinetic energy or `W=(HC)/(lambda)-K.E` `=((6.26 xx 10^(-34) xx 3 xx 10^(8))/(3333xx10^(-19)))-(0.6xx1.6xx10^(-19))` `=(5.96 xx 10^(-19))-(0.96 xx 10^(-19))` `W=5 xx 10^(-19)J` `W=(5 xx 10^(-19))/(1.6 xx 10^(-19))eV.` W = 3.125 eV. |
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