ورقة عمل التأثير الكهروضوئي

The given statement is true. The work function is a characteristic property of a metal, which refers to the minimum amount of energy required to remove an electron from the surface of the metal and move it to a point infinitely far away. It is specific to each type of metal and depends on factors such as the metal's composition and crystal structure. Therefore, the work function is indeed a distinctive property of the material.

To emit electrons from the surface of a metal, the frequency of the incident light must be sufficient. This is because the energy of a photon is directly proportional to its frequency. Therefore, increasing the frequency of the incident light will provide enough energy to overcome the work function of the metal and release electrons.

The kinetic energy of emitted electrons is not affected by changes in the intensity of the incident light.

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If the intensity of the incident light on a photocathode of a photoelectric cell is reduced to one-fourth, the maximum kinetic energy of the emitted electrons does not change.

The statement is false. The stopping potential for a photoelectric surface increases with the intensity of the incident light, not the voltage. The stopping potential is directly proportional to the frequency of the incident light, according to the photoelectric effect.

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The frequency threshold of a surface emitting a certain number of photoelectrons depends on the type of surface material. Different materials have different energy levels for their electrons, and the frequency of the incident light needs to be high enough to provide the necessary energy to remove electrons from the surface. Therefore, the type of surface material determines the frequency threshold for emission.

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