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FranInternal photoemission is a process in which a photon with sufficient energy is absorbed by a material, causing an electron to be emitted from the material. This electron emission occurs within the material itself, as opposed to from the material's surface. Internal photoemission is often used in the study of electronic properties of materials, such as bandgap measurements in semiconductors.
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What happens to the electrons after absorbing energy from light?
After absorbing energy from light, electrons in an atom can move to higher energy levels or be released from the atom altogether in a process called photoemission.
How can one determine the work function of a material?
The work function of a material can be determined by measuring the minimum amount of energy needed to remove an electron from the material's surface. This can be done using techniques such as photoemission spectroscopy or the photoelectric effect.
How is internal energy defined?
Internal energy is the sum of all microscopic kinetic and potential energies of the particles within a system. It includes the energy associated with the motion and interactions of atoms and molecules. Internal energy is a state function, meaning it depends only on the current state of the system and not on the path taken to reach that state.
What is the meaning of internal heat generation?
Internal heat generation refers to the production of heat within a system or object as a result of various processes such as chemical reactions, friction, or electrical resistance. This phenomenon can lead to an increase in temperature within the system, impacting its overall thermal properties and performance.
What happens to internal energy when mechanical work is done?
When mechanical work is done, the internal energy of a system can change. If work is done on the system, the internal energy increases. Conversely, if work is done by the system, the internal energy decreases. This change in internal energy is governed by the first law of thermodynamics.
