The Einstein's photoelectric equation K.Emax=hf - hfo is valid for:
Correct answer: B. The electrons coming out of the metal surface with full surplus energy (without losing any energy during collisions with the atoms of metal)
- A. The electrons coming out of the metal surface with minimum energy
- B. The electrons coming out of the metal surface with full surplus energy (without losing any energy during collisions with the atoms of metal)
- C. The photons of light that reflect back from the metal surface
- D. All the electrons that come out of the metal surface
Explanation
If the energy of the photon is greater than the work function, then a part of it is used in escaping an electron from the metal surface. The remaining energy is taken up by electron as its kinetic energy. Energy of photon = work function + Max. K.E. of photoelectrons hf= Φ + K.E.max K.E.max = hf - Φ = hf - hfo
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About Photons and the Particle Model of Light
The particle model treats light as photons with energy E equals hf and momentum related to wavelength. Questions involve the photoelectric effect, work function, threshold frequency, stopping potential and photon energy, while distinguishing particle behaviour from the wave description of interference and diffraction.
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