00:01
Now here in this question, basically look at a gang, right, a radar gun, right? suppose this is a reggaon, which emits, you know, this radio waves, right, electromagnetic waves.
00:13
And there's a car somewhere here is traveling at a certain speed to v, i call the v, let's say, as s, okay? and then, you know, if the wave is reflected, i mean, the wave, the same wave has a frequency, let's say, if, and i want to say if, yes, we can call it fs.
00:36
Sorry, let's call it fs.
00:40
And then this wave comes, hit the car and reflect back.
00:47
So the reflective waves actually is reflected by the car, and that means the source of this reflector actually is moving with speed vs, right? so the received frequency, we have different, and the received frequency, the received, i mean, the frequency of the received wave, we have different frequency, which i call fo.
01:08
And fo minus fs will be equal to the we with the speed of sound in air, right, which is, i think, roughly 340 meter per second and divided by v minus vs, minus because the car is moving toward the radar, right...