What will be the energy gained by an electron when it has been accelerated by a potential difference of 1 volt?
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A.
1.602 ×10 –16 J
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B.
1.602 ×10 –19 J
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C.
1.602 ×1016 J
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D.
1.602 ×10 19 J
Correct Answer:
B. 1.602 ×10 –19 J
Explanation:
An electronvolt (eV) is a unit of energy defined as the kinetic energy acquired by a single electron when it is accelerated through an electric potential difference of one volt. To determine its value in Joules, you multiply the charge of an electron (approximately 1.602 x 10^-19 Coulombs) by the potential difference (1 Volt). Since 1 Joule is equal to 1 Coulomb-Volt, the resulting energy gain is exactly 1.602 x 10^-19 Joules. This makes the electronvolt a highly practical unit for measuring the very small energy scales associated with atomic and particle physics.
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