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NEET2008PhysicsDual Nature of MatterActual

The work function of a surface of a photosensitive material is 6.2 eV . The wavelength of the incident radiation for which the stopping potential is 5 ~V lies in the

Options

  1. Aultraviolet region
  2. Bvisible region
  3. Cinfrared region
  4. DX-ray region

Correct answer

A. ultraviolet region

Step-by-step solution

According to laws of photoelectric effect KE _ =E- where is work function and KE _ is maximum kinetic energy of photoelectron. array l h v=e V₀+ or h v=5 eV +6.2 eV =11.2 eV = ( 12400 11.2 ) Å 1000 Å array Hence, the radiation lies in ultraviolet region.

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