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(II) When UV light of wavelength 255 nm falls on a metal...

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Key Concepts

Photoelectric Effect

The photoelectric effect is the process by which electrons are emitted from a metal surface when it is exposed to light of sufficiently high energy. This phenomenon supports the idea that light behaves as particles (photons) that carry quantized energy, which can be transferred to electrons.

Work Function

The work function is the minimum energy required to remove an electron from the surface of a metal. It is a characteristic property of the metal and represents the energy barrier that must be overcome for the electron to be emitted.

Photon Energy

Photon energy refers to the energy carried by a single photon, which is calculated using the equation E = (h * c) / ?, where h is Planck's constant, c is the speed of light, and ? is the wavelength of the light. This quantized energy determines whether the incident photons have enough energy to eject electrons from the metal.

Energy Conservation in the Photoelectric Effect

In the photoelectric effect, the energy of the incident photon is used to overcome the work function of the metal and to impart kinetic energy to the emitted electron. This is expressed by the equation: photon energy = work function + maximum kinetic energy of the electron.

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