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COMEDK2019PhysicsDual Nature of Matter

Threshold wavelength for photoelectric emission from a metal surface is 5200 Å . Photoelectrons will be emitted when this surface is illuminated with monochromatic radiation from

Options

  1. A50 ~W IR-lamp
  2. B10 ~W IR-lamp
  3. C1 ~W IR-lamp
  4. D50 ~W UV - lamp

Correct answer

D. 50 ~W UV - lamp

Step-by-step solution

Threshold wavelength of the metal, ₀=5200 Å =5200 10⁻¹⁰ ~m Frequency of the radiation, v₀= c aligned &= 3 10⁸ 5200 10⁻¹⁰ &=057 10¹⁵ ~Hz &=5.7 10¹⁴ ~Hz aligned The frequency of infrared radiation is lower than the threshold frequency of the metal. Hence, the surface of the metal is illuminated with monochromatic radiation which is greater than 5.7 10¹⁴ ~Hz . The 50 ~W LV-lamp is suitable for this purpose.

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