00:01
All right, this is a pretty simple question.
00:03
All we have to know is one thing that for a given wave, the speed of light is always equal to that wave's frequency times that wave's wavelength.
00:16
These two things are always what we call inversely related.
00:20
So that means that if we want to know the frequency, we can solve for it as c, which is the speed of light, the speed of our electromagnetic waves divided by the wavelength.
00:34
Okay? and we know that the speed of light, c, is 3 times 10 to the eighth meters per second.
00:43
And we've been told that the wavelength of these x -rays are about 0 .3 nanometers.
00:50
Now, nano means 10 to the minus 9 meters.
00:56
Okay? the meters are going to cancel on the top and bottom...