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When the energy of the incident radiation is increased by 20% ,the kinetic a metal surface increased from 0.5 eV to 0.8 eV.The work function of the metal is ….. |
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Answer» 0.65 EV `therefore` In first condition 0.5 eV=hf-`phi`…(1) and By increasing energy 0.8 eV=1.2 hf-`phi`…..(2) multiplying EQUATION (1) by 1.2, 0.6 eV=1.2 hf-1.2 `phi` 0.8 eV=1.2 hf-`phi` `(--+)/(-0.2 eV=-0.2 phi)` `therefore phi=1.0 eV` |
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