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AP EAMCET20227 Jul 2022Evening ShiftChemistryStructure of AtomActual

The work function of a metal M is 6.3 eV . The wavelength of the incident radiation required to just eject the electrons from its surface (in nm ) is

Options

  1. A102
  2. B330
  3. C197
  4. D310

Correct answer

C. 197

Step-by-step solution

The work function of the metal M is 6.3 eV . aligned 1 eV & =1.6 10⁻¹⁹ ~J E & =6.3 1.6 10⁻¹⁹ ~J & =10.08 10⁻¹⁹ ~J aligned The wavelength of radiation can be calculated. Using the formula, aligned E & = h c & = h c E = 6.6 10⁻³⁴ Js 3.0 10^8 ~ms ⁻¹ 10.08 10⁻¹⁹ ~J & =1.9642 10⁻⁷ ~m & =197 ~nm aligned

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