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JEE Advanced2011ChemistryStructure of AtomActual

The work function ( ) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 ~nm wavelength falls on the metal is

Correct answer

4

Step-by-step solution

Energy of photon = h c J = h c e eV = 6.625 10⁻³⁴ 3 10^8 300 10⁻⁹ 1.602 10⁻¹⁹ =4.14 eV For photoelectric effect to occur, energy of incident photons must be greater than work function of metal. Hence, only Li , Na , K and Mg have work functions less than 4.14 ~V .

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