00:01
Okay, so we have a sound wave coming in and hitting water from air at an angle of 12 degrees from the perpendicular line.
00:26
And it's coming in at a velocity of 340 meters per second, call that v1.
00:36
And then it's going to come out on the other side, so it's not actually going straight, but it's going to have a different angle here.
00:52
So we don't know what that is and we want to find it.
00:55
But we do have the velocity that it comes out into the water at, which is 1 ,510 meters per second.
01:08
And so then there's also an, an index of refraction n, so n1 for air, and then n2, which is for water.
01:22
So what we want to do is use the equation n1, sine of theta 1 equals n2 times the sign of theta 2, where this here is theta 1, and this is theta 2.
01:48
This angle.
01:49
So we're going to solve for theta 2.
01:52
But so since we don't know what n is, we can also just use the fact that the index of refraction is equal to the velocity in that medium over the speed of light.
02:09
And then same thing for n2.
02:14
V2 over c...