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JEE Main202331 Jan 2023Evening ShiftPhysicsDual Nature of MatterActual

If the two metals A and B are exposed to radiation of wavelength 350 nm . The work functions of metals A and B are 4 . 8 eV and 2 . 2 eV . Then choose the correct option

Options

  1. AMetal B will not emit photo-electrons
  2. BBoth metals A and B will emit photo-electrons
  3. CBoth metals A and B will not emit photoelectrons
  4. DMetal A will not emit photo-electrons

Correct answer

D. Metal A will not emit photo-electrons

Step-by-step solution

As we know, for photoelectric emission, h ν > ϕ . Now, h ν = h c λ = 1240 350   eV = 3 . 54   eV Therefore, only metal B will emit photoelectrons.

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