A laser produces photons of energy and emits photons every second

PHYSICS · Subjective · A Level · Physics · Particles and radiation · Particles and radiation

Problem

A laser produces photons of energy

3.0\,\text{eV}

and emits

5.0\times10^{18}

photons every second. (Take

1\,\text{eV}=1.60\times10^{-19}\,\text{J}

.) Determine the power output of the laser in watts.