00:01
Okay, in this question we're talking about a laser, which is emitted in short pulses.
00:08
And we want to know in question a, what is the energy of a singular pulse? so we're also told that the average power of each pulse is about 0 .6 watts.
00:18
And power is just a way to write energy over time.
00:26
So to find the energy for question a, we just want to solve this equation for energy.
00:31
So we'll just multiply the delta t to the other side.
00:35
Energy equals p delta t.
00:38
So we can plug in the power and plug in the length of a pulse.
00:43
And when we do that, we get 3 .0, excuse me, 1 .2 times 10 to the negative 2 joules.
00:56
And they also want the answer in electron volts.
00:59
So we can write that as equal to 7 .49 times 10.
01:04
To 16 electron volts.
01:11
Okay...