In the emission of photoelectrons, the number of...

In the emission of photoelectrons, the number of photoelectrons emitted per unit time depends upon
(a) energy of the incident radiation
(b) intensity of the incident radiation
(c) frequency of the incident radiation
(d) wavelength of the incident radiation

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Key Concepts

Photoelectric Effect

This is the phenomenon in which electrons are emitted from a material when it is exposed to light (or other electromagnetic radiation) of sufficient frequency. The photoelectric effect demonstrates the particle-like properties of light and supports the quantum theory of light, establishing that the emission of electrons occurs only if the incident photons have energies above a certain threshold.

Intensity of Electromagnetic Radiation

Intensity refers to the number of photons hitting a given area per unit time. In the context of the photoelectric effect, the number of photoelectrons emitted is directly proportional to the intensity of the incident light, provided the photon energy is above the threshold necessary to liberate electrons.

Photon Frequency and Energy Threshold

Although the kinetic energy of each emitted electron depends on the frequency of the incident radiation (with each photon carrying energy proportional to its frequency), the frequency itself primarily determines whether an electron can be ejected at all. A photon must have a frequency (or energy) above the material’s threshold for the photoelectric effect to occur, but the number of electrons emitted per unit time is determined by the light’s intensity.

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