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BITSAT2014PhysicsDual Nature of MatterActual

The threshold wavelength of the tungsten is 2300 Ã… . If ultraviolet light of wavelength 1800 Ã… is incident on it, then the maximum kinetic energy of photoelectrons would be about -

Options

  1. A1.49 eV
  2. B2.2 eV
  3. C3.0 eV
  4. D5.0 eV

Correct answer

A. 1.49 eV

Step-by-step solution

K _ = hv - hv ₀= hc ( 1 - 1 ₀ )1.24 10⁻⁶ ( 10⁸ 18 - 10⁸ 23 )=1.49 eV

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