Question

kinetic energy does not depend on light intensity.why???​

Answer 1

K.Emax= hf- w

The emitted electron would have a certain kinetic energy and that would be the maximum kinetic energy. The energy of the photon would be equal to the energy of the electron emitted but while calculating the K.E the work function is subtracted from the energy of the photon(hf) since some amount of energy would be required to remove the electron from the atom and so the kinetic energy will be the energy of the photon subtracted by the work function, since it determines the the amount of energy required to eject an electron.

Now, if the intensity of the light with energy above the work function is increased the interaction of the photons would be more and so the more electrons would be emitted but the max kinetic energy would remain the same since the energy of the photon and the work function will be same. On the other hand, if the frequency or the energy is increased the work function would remain the same but energy would be greater and so the the max kinetic energy would comparatively be greater( you can understand the explanation by analyzing the formula for K.E given above).


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Answer 2

According to the classical wave theory of light, the intensity of the light determines the amplitude of the wave, and so a greater light intensity should cause the electrons on the metal to oscillate more violently and to be ejected with a greater kinetic energy.