Home › CBSE Class 12 (Science) › Physics › Dual Nature of Radiation and Matter › One electron volt is equal to how many joules?
One electron volt is equal to how many joules?
A1.602 × 10⁻²⁷ J
B9.11 × 10⁻³¹ J
C1.602 × 10⁻³¹ J
D1.602 × 10⁻¹⁹ J
Answer & Solution
Correct answer: D. 1.602 × 10⁻¹⁹ J
An electron falling through 1 volt gains e × 1 V = 1.602 × 10⁻¹⁹ J, which defines the electron volt.
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