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# What is the law of photoelectric effect?

Hello friends, my name is Bhupendra and in today’s article we will tell you what is the law of photoelectric effect, we will give you complete information about it, so you read our article completely.

## Laws of photoelectric emission-

1. from a metal surface the rate of emission of light electrons, are directly proportional to the intensity of light falling on a metal surface.
2. of emitted light electrons maximum kinetic energydoes not depend on the intensity of the incident light.
3. of light electrons maximum kinetic energyincreases as the frequency of the incident light increases.
4. If the frequency of the incident light is less than a minimum frequency, no electrons are emitted from the metal surface. to this minimum frequency threshold frequency it is said. The value of sill frequency is different for different metals.
5. There is no time lag between the light falling on the metal surface and the electrons being emitted from the metal surface, that is, electrons are emitted as soon as the light falls on the metal surface.

Failure of wave theory to explain photoelectric emissionThe observed features of photoelectric emission cannot be explained by the wave theory of light. The main reasons for this are as follows-

1. According to the wave theory, increasing the intensity of the incident light will increase the amplitude of the waves, due to which the energy carried by the waves will increase, as a result, the electrons of the metal will get more energy when the light of more intensity is incident. The energy of the emitted light electrons will increase, which is contrary to experimental facts.
2. According to wave theory, if the intensity of the incident light is such that it can provide enough energy to emit electrons from the metal, then whatever the frequency of the incident light, electrons should be emitted from the metal plane.
3. According to wave theory, the energy carried by light waves does not go to any one electron in the metal, but is opposite to all the electrons present in the illuminated area of ​​the metal.

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