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What is the value of 1 electron volt (eV), which is especially used for nuclear science?
2.202 ×10⁻¹¹ joules
1.602 ×10⁻¹⁹ joules
1.902 ×10⁻¹⁰ joules
1.202 ×10⁻¹⁵ joules
602 ×10⁻¹⁹ joules
An electron volt (eV) is the amount of kinetic energy gained by a single electron accelerating from rest through an electric potential difference of one volt. It is a unit of energy commonly used in atomic, nuclear, and particle physics because the energies involved are extremely small.
An electron volt (eV) is the amount of kinetic energy gained by a single electron accelerating from rest through an electric potential difference of one volt. It is a unit of energy commonly used in atomic, nuclear, and particle physics because the energies involved are extremely small.
Think of an electron volt like a 'custom' unit of energy for tiny particles, just as we use grams instead of kilograms when weighing a small diamond, because Joules are simply too large a unit for individual subatomic particles.
E=qV — Fundamental definition where q is charge and V is potential difference
1 eV=1.602×10−19 J — Conversion factor
The energy E acquired by a particle of charge q moving through a potential difference V is given by E=qV. Since the elementary charge e of an electron is approximately 1.602×10−19 coulombs, and the potential difference is 1 volt, the energy in Joules is 1.602×10−19 C×1 V=1.602×10−19 Joules.
One eV is the energy gained by an electron moved across a potential difference of 1 volt.
It is not a unit of force or power, but energy.
Commonly used scales include keV (103 eV), MeV (106 eV), and GeV (109 eV).
Simplifies calculations in atomic and nuclear physics by avoiding very small decimals.
Directly relates to the elementary charge of an electron.
Not an SI base unit; must be converted to Joules for standard thermodynamic calculations.
Describing the binding energy of electrons in atoms.
Measuring the energy of gamma rays and particle accelerators.
The value 1.602×10−19 J is derived from the elementary charge constant.
The other options provided are distractors that do not correspond to standard physical constants in this context.
B is correct — 1 electron volt is equivalent to 1.602×10−19 joules, representing the energy gained by an electron moving through 1 volt.
Always remember that 1 eV is an energy unit, while potential difference (V) is measured in Volts. Do not confuse the two when calculating acceleration of particles.
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