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AP EAMCET202317 May 2023Morning ShiftPhysicsDual Nature of MatterActual

When light of wavelength incidents on a photosensitive material, photoelectrons are emitted. If the wavelength of the incident light is reduced by 50 % , the maximum kinetic energy of the emitted photoelectrons becomes 3 times the initial maximum kinetic energy. The work function of the material is ( h - Planck's constant, c - Speed of light in vacuum)

Options

  1. Ahc
  2. Bhc 2
  3. C2 hc
  4. Dhc 3

Correct answer

B. hc 2

Step-by-step solution

From the photoelectric equation hc = E + ...(i) When ^ =0.5 = 2 Maximum Kinetic Energy, E ^ =3 E 2 hc =3 E + ... (ii) Solving equation (2) by (1), we have work function, = hc 2

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