Question

It is observed in an experiment on
photoelectric effect that an increase in the
intensity of the incident radiation does
not change the maximum kinetic
of the electrons. Where does the extra
energy of the incident radiation go? Is it
lost? State your answer with explanatory
reasoning
energy​

Answer 1

Answer:

The maximum kinetic energy of a photoelectron depends on the frequency of the incident radiation and the threshold frequency for the metal. It has nothing to do with the intensity of the incident radiation. The increase in intensity results in an increase in the number of electrons emitted per second.

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Answer 2

The increase in intensity results in an increase in the number of electrons emitted per second

Explanation:-

When electromagnetic radiation with a frequency greater than the threshold frequency is incident on a metal surface, there is an emission of electrons. It is observed that not every incident photon is effective in liberating an electron. In fact, the number of electrons emitted per second is far less than the number of photons incident per second. The photons that are not effective in the liberation of electrons are reflected (or scattered) or absorbed resulting in rising in the temperature of the metal surface. The maximum kinetic energy of a photoelectron depends on the frequency of the incident radiation and the threshold frequency for the metal. It has nothing to do with the intensity of the incident radiation. The increase in intensity results in an increase in the number of electrons emitted per second.