00:01
Guys new problems to chapter 71 type of electromagnetic radiation has a frequency of 101.7 miller hurts.
00:17
Another type has a wavelength of 202.1.
00:25
2 times 10 tend to be negative 10 m.
00:33
And then we have another which has a radiation with photons equal to 3.97 times 10 to the negative 19 jewels her photon.
00:54
So they want to identify each type of electromagnetic radiation and put them in order of increasing photon energy and increasing frequency.
01:03
Well first of all a those frequency is proportional to photon energy.
01:08
So so they're gonna have to be in the same order for both.
01:19
So the way we so so the way we do this, we're going to convert both.
01:27
Be hurt too.
01:30
Yes, we're going to convert the hurts too.
01:33
Two nanometers.
01:36
And we're going to convert this 12 nanometers.
01:37
And convert this one's an animal years.
01:39
So we're gonna use the formulas e.
01:41
Is equal to h.
01:46
C.
01:48
Over lambda.
01:49
Or we can write this as lambda is equal to h.
01:55
C.
01:55
Over e.
01:57
We can also write as lambda is equal to to see over neal where mu is going to be our frequency.
02:18
So for the first one we're going us we're gonna write the formula laugh.
02:27
In fact it might be easier just to do it like this where we have three different sections were gone.
02:40
And so λ one is equal to three times 10 to the a meters per second.
02:50
And don't forget one hurt is equal to one inverse seconds and the prefix mega.
02:55
That's 10 to 6 to one on 1.7 times 10 to the 6th inverse seconds.
03:05
So lambda one is going to be equal to okay, mhm 2nd.
03:27
So this is going to be two 95 meters...