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Question

Chectielt. hhon lsh hits the sartace etee to Electons to leave the tom an fh's There were 3 phenomena that puzzled classical physicists but can be explained by quantumlee physics. Explain the following behavior from a quantum physics perspective (10 pts each) Brighter light causes an increase in current but does not give individual electrons more kinetic energy a. The maximum kinetic energy of the of the electrons is dependent on the frequency of the light b. For a given metal, there is a threshold frequency below which no electrons are emitted regardless of the intensity of the light. c.

Explanation / Answer

Intensity simply how many number of photons are liberated, if more photons are liberated then more number of electrons are absorbs them and emission of electrons takes place and it leads to increase in the current. but even if you increase the intensity there is no change in energy of photon whenever the photon energy doesnot varies then the kinetic energy does not varies. simply the current decided by the intensity and the kinetic energy is decided by the photon frequency or energy.

when higher frequency(E proportional to frequency) some of the energy is used to work function and the remaining is used to kinetic energy for a particular metal work function is constant so higher the frequency then kinetic energy is more.

If the incident photons energy or frequency less than threshold frequency there is no chance even to finish work function and releasing from metal surface. Even if you increase the intensity number of photons increases but for these photons there is no energy to remove the electron from surface hence even if you increase intensity no change in KE

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