Answer:
a) 6.7 * 10⁴ W b) 8.5* 10¹⁰ W/m²
Explanation:
a) The power of one laser pulse, by definition of power, is equal to the energy expended during the emission of the pulse, divided by the time during which the energy was present, as follows:
P = ΔE/Δt = 10⁻³ J / 15*10⁻⁹ sec = 6.7* 10⁴ W
b) The intensity, or power density, of the light wave, is just the power that we just calculated in a) divided by the cross-section area traversed by the pulse, which is a circle of 1.0 mm diameter.
So, we can write the following expression:
I = P/A = P / π*(d²/4) = 6.7*10⁴ W /( π*(10⁻³)²/4) m² = 8.5* 10¹⁰ W/m²
