Question

1 electron volt per second is equal to:

[1 mark]

• A. $1.6\times {10}^{-19}kW$
• B. $1.6\times {10}^{-13}W$
• C. $1.6\times {10}^{-16}W$
• D. $1.6\times {10}^{-22}kW$

Answer 1

The correct option is D $1.6\times {10}^{-22}kW$

Electron volt (eV) is the unit of energy that is equal to $1.6\times {10}^{-19}J$.

When we express it as electron volt per second, it becomes a unit of power.

$1eV/sec=1.6\times {10}^{-19}J/sec$
$1eV/sec=1.6\times {10}^{-19}W=1.6\times {10}^{-22}kW$