Concept explainers
The correct statement about the energy of emitted electrons when light incident on a metal surface.
Answer to Problem 1MC
Option (b) vary with the
Explanation of Solution
Given Info:
When a photon of sufficient energy incident on a metal surface, its energy is transferred into the electrons on the metal surface. Using this energy, electrons leaves the metal surface and gain kinetic energy. This is called the
Conclusion:
Electrons gain kinetic energy from the energy of photon. Energy of photon strictly depends on its frequency. So energy of emitted electron is proportional to frequency of incident light.is Thus, option (b) is correct.
Intensity of light is a measure of number of photons incident on a unit area. Increase in intensity means the increase in number of incident photons only. Intensity cannot increase the kinetic energy of electron emitted from the metal surface. Thus, option (a) is incorrect.
Speed of light in a medium is a constant. Energy of emitted electron from metal surface has no any relation with speed of incident
The kinetic energy of emitted electrons can be calculated using Einstein’s photoelectric equation. Thus, option (d) is incorrect.
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Chapter 9 Solutions
The Physical Universe
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