00:01
In this problem, we want to find the propagation direction of an electromagnetic wave given that we know it's electrical and its magnetic components.
00:09
Now, when we want to find the propagation direction for an electromagnetic wave, the first thing that we want to do is cross the two components.
00:16
So you just take your regular cross product.
00:19
But the thing to remember is that when we cross an i vector with a j vector, the result is negative k.
00:25
That's just a rule for the way that we write vectors in physics.
00:27
Now, when we rewrite our two components, we'll find that we just get our negative k direction, or k hat, i should say rather, multiplied by e times b times sine squared of our two variables here.
00:45
Now we want to find the unit vector specifically...