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KCET2008PhysicsDual Nature of Matter

When a piece of metal is illuminated by a monochromatic light of wavelength , then stopping potential is 3 ~V _ s . When same surface is illuminated by light of wavelength 2 , then stopping potential becomes V _ s . The value of threshold wavelength for photoelectric emission will be

Options

  1. A4
  2. B8
  3. C4 3
  4. D6

Correct answer

A. 4

Step-by-step solution

According to Einstein's photoelectric equation eV = hc [ 1 - 1 ₀ ] Ist case 3 eV _ s = hc [ 1 - 1 ₀ ] IInd case eV _ s = hc [ 1 2 - 1 ₀ ] Dividing Eq. (i) by Eq. (ii), we get ₀=4

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