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COMEDK2013PhysicsDual Nature of Matter

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

Options

  1. A1 ~W~IR lamp
  2. B50 ~W~UV lamp
  3. C50 ~W~IR lamp
  4. D10 ~W~IR lamp

Correct answer

B. 50 ~W~UV lamp

Step-by-step solution

Given, ₀=5200 Å=5200 10⁻¹⁰ ~m Threshold frequency, f₀= c ₀ = 3 10⁸ 5200 10⁻¹⁰ =5.76 10¹⁴ ~Hz It lies in the frequency range of UV-rays, so 50 ~W UV lamp is used for this emission.

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