00:01
We're told that our energy difference, delta e is equal to 0 .117 ev, and we're asked to determine the frequency, wavelength, and then the part of the electromagnetic spectrum.
00:09
So the relationship between frequency, wavelength, and change in energy, delta e, is delta e is equal to h times f, where f is the frequency, which is equal to hc over lambda, since the frequency is equal to the speed of light divided by lambda for traveling light.
00:23
So what we have here is, for part a, we have the frequency is equal to the change in energy delta e divided by planks constant.
00:35
Planks constant has units of energy times second.
00:38
So we want to use the units of electron volt seconds version of planks constant since our delta e value is given an electron volts.
00:45
So that's 4 .1357 times 10 to the minus 15 electron volts seconds for planks constant.
00:51
Plugging these values in, we find that delta e is equal to 28 .2 times 10 to the 12 hertz.
01:02
Since we have units of 1 over seconds, that's the same as the units of hertz.
01:06
So we'll, excuse me, yeah, times 10 to the 12...