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KVPY2014PhysicsDual Nature of Matter

When ultraviolet radiation of a certain frequency falls on a potassium target, the photoelectrons released can be stopped competely by a retarding potential of 0.6 ~V . If the frequency of the radiation is increased by 10 % , this stopping potential rises to 0.9 ~V . The work functin of potassium is

Options

  1. A2.0 eV
  2. B2.4 eV
  3. C3.0 eV
  4. D2.8 eV

Correct answer

B. 2.4 eV

Step-by-step solution

E= +e VE= + e (.9)1.1 E = + e (.9).1 E =.3 e E =3 eV put 2.4 eV .1 E =.3 e E =3 eV put 2.4 eV

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