00:01
All right, so we're looking at waves traveling.
00:05
We're given some frequencies.
00:07
We're given some speeds, and we want to find the wavelengths.
00:10
Generally, if you're given the frequency, it's going to be an inverse seconds.
00:13
That's what a hertz is.
00:16
If you're given the speed, it's going to be in meters per second.
00:19
We're given a very special one here.
00:20
3 .0 times 10 to 8 meters per second is the speed of light.
00:24
That's what radio waves travel out there.
00:28
They're light waves.
00:29
And then our wavelength, given by the greek letter lambda, is in meters.
00:33
So if you're given a frequency and a speed, you can do meters per second divided by one over seconds.
00:40
That'll give you meters.
00:42
V over f gives you lambda.
00:45
We're given am frequencies of 550 kilohertz to 1 ,600 kilohertz.
00:55
And we're given fm frequencies of 88 megahertz to 108 megahertz.
01:03
Kilo is 1 ,000...