Question

1 electron volt (eV) = _______ J.
1. 9 × 10^-9
2. 9 × 10^-19
3. 1.6 × 10^-9
4. 1.6 × 10^-10
5. 1.6 × 10-19

Answer 1

Correct Answer - Option 5 : 1.6 × 10-19

CONCEPT:

• eV or Electron volt: It is the unit of energy.
  • It is commonly used in nuclear physics and atomic physics.
  • It is equal to the energy gained by an electron when the electrical potential at the electron increases by one volt.

1 electron volt = 1.602 × 10⁻¹² erg, or

1 eV = 1.602 × 10⁻¹⁹ joule.

• The other abbreviation are MeV indicates 10⁶ eV; GeV 10⁹ eV; and TeV 10¹² eV.

EXPLANATION:

1 eV = 1.602 × 10−19 joule. 

So the correct answer is option 4.