allery1 electron-volt (eV) equals
A1.602 × 10⁻⁶ J
B9.11 × 10⁻³¹ J
C6.63 × 10⁻³⁴ J
D1.602 × 10⁻¹⁹ J
Answer & Solution
Correct answer: D. 1.602 × 10⁻¹⁹ J
1. 1 eV is defined as the energy gained by an electron across 1 volt of potential difference.
2. Numerically, 1 eV = e × 1 V = 1.602 × 10⁻¹⁹ J.
3. eV is a convenient energy scale for atomic and nuclear physics.
4. 9.11 × 10⁻³¹ kg is the electron mass; 6.63 × 10⁻³⁴ J·s is Planck constant.
_Source: syllabus Physics, Ch 11 "Dual Nature of Radiation and Matter", §11.2_
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