Explanation
Intensity increases means more photons of same energy will emit more electrons of same energy, hence only photoelectric current increases.
For emission of electrons incident energy of each photon must be greater than work function (threshold energy).
In photoelectric effect for a given photosensitive material, there exists a certain minimum cut-off frequency, called the threshold frequency below which no emission of photoelectrons takes place no matter how intense the light is.
The photoelectric current is directly proportional to the Intensity of illumination. Therefore a change in the intensity of the incident radiation will change the photocurrent also.
In tungsten, photoemission take place with a light of wavelength 2300 Å. As emission of electron is inversely proportional to wavelength, all the wavelengths smaller then 2300 Å will cause emission of electrons.
The saturation photoelectric current is directly proportional to the intensity of incident radiation but it is independent of its frequency. Therefore, the saturation photoelectric current becomes double, when both intensity and frequency of the incident light are doubled.
X-rays are electromagnetic waves of wavelength ranging from 0.1 to 100 Å.
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