00:04
Okay, so this question asks us to actually characterize different uv region.
00:12
And i would suggest you to check the book on page 428.
00:19
And we can start doing that.
00:22
So first, you need to know the category of the uv region.
00:28
There are three, actually, three parts.
00:31
One part is called vacuum uv.
00:39
And later, it's the near uv.
00:47
And then you have the visible range.
00:55
So for the vacuum uv, it's usually between, for the wavelength, is usually between 100 nanometer to 200 nanometers.
01:07
And for the near uv, it's between 200 to 400 nanometer, the wavelengths.
01:17
And for the visible, it's around 400 to 800 nanometer so now we can try to assign the regions right so the first one is iodine irons and it already tells you the iodine the absorption right lies on the 226 so it's actually in the near uv ranch right the iodine and the second one is c204 ions.
02:07
And the absorption peak lies on the 250.
02:12
So same, right, it's in the near uv range.
02:22
And the third one is water...