00:01
First we need to figure out the energy of the transition.
00:06
This will be equal to h plunks constant times speed of light divided by the wavelength.
00:22
Plunk's constant is 6 .6 to 6 times 10 to the negative 34 joules seconds.
00:30
Well, speed of light is 2 .9979 times 10 to the 8 meters per second.
00:37
We divide that by 103.
00:42
Nano means 10 to the negative 9 meters.
00:49
So this is 103 nanometers written so that the meter units will cancel.
00:57
And we get 1 .929 times 10 to the negative 18 joules.
01:06
Then we're going to use the riddberg equation to figure out the energy level to which it transitioned.
01:15
The rydberg equation tells us that the change in energy is equal to negative 2 .178 times 10 to the negative 18 times 1 over the final.
01:41
Energy level squared minus one over the initial energy level squared.
01:50
This negative sign is if it's going from a higher energy level down to a lower energy level and energy is released.
02:00
In this case, it tells us that it absorbs a photon, so energy is added in.
02:08
If that's the case, then instead of getting a negative energy, we'll get a positive energy, and we don't need this negative sign.
02:17
So the change in energy, we already calculated 1 .929 times 10 to the negative 18 joules.
02:28
That'll be equal to 2 .178 times 10 to the negative 18 joules...