Question

The output of a laser has pulse duration of 20 ms and average output power of 1.75 W per pulse. How much energy is released per pulse if wavelength is 5890 Å?

(a) 0.011 J

(b) 0.024 J

(c) 0.035 J

(d) 0.047 J

I got this question in quiz.

This interesting question is from Interaction of External Energy with the Atomic Energy States topic in section Laser of Engineering Physics II

Answer 1

Right choice is (c) 0.035 J

The best explanation: As we know, Energy = Power X Time

= 1.75 W X 20 X 10^-3 s

 = 0.035 J.