Which of the following is the unit of work function (φo) in photoelectric emission?
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A.
Volts
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B.
Amperes
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C.
Electron volt (eV)
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D.
Coulomb
Correct Answer:
C. Electron volt (eV)
Explanation:
The work function (φ₀) represents the minimum amount of energy required to liberate an electron from the surface of a specific metal. Since this is a measure of energy, it is expressed in units appropriate for subatomic scales. The electron volt (eV) is the standard unit used to quantify this energy in photoelectric emission, where 1 eV is defined as the energy gained by an electron accelerating through a potential difference of one volt. While other options like Volts (potential), Amperes (current), and Coulombs (charge) are related to electricity, only the electron volt serves as a measure of energy. Thus, the work function is measured in electron volts (eV).
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