Question

What is the energy equivalent of 3 eV? a) 1.6x10-19J b) 3.2x10-19J c) 4.8x10-19J d) 0.53x10-19J

Answer 1

1 electron volt is the energy gained or lost by one electron when it
climbs or falls through a potential difference of 1 volt.

That amount of energy is  1.602 x 10⁻¹⁹ joule (rounded)

3 times that much energy is  (3) x (1.602 x 10⁻¹⁹ joule)  =

                                                      4.806 x 10⁻¹⁹ joule (rounded)