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In a photo electric effect, the energy of photon striking the metallic surface is 5.6 x 10^-19 J. The kinetic energyof the ejected electrons is 12.0 x 10^-20 J. The work function is?1) 6.4 x 10^-19 J2) 6.8 x 10^-19 J3) 4.4 x 10^-19 J4) 6.4 x 10^-20 J |
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Answer» 3) 4.4 × 10^-19 JExplanation:Given, The ENERGY of photon STRIKING the metallic SURFACE is 5.6 x 10^-19 J. The kinetic energy of the ejected electrons is 12.0 x 10^-20 J.Work function = Energy of photon - K.E(electrons) = 5.6 × 10^-19 - 1.2 × 10^-19 = 4.4 × 10^-19 J |
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