Source is also moving 5 more meters away from you. You're on the side of the source that the source is movingĪway from, it would be 10 meters, but every second the Meters apart, in this case, this guy has closed The right before emitting the next pulse. Right here- and then, it moves 5 meters to It's emitting a pulse- so let's say it emitted a pulse The source is coming towards you or whether it's Right here? It depends on what side, whether The distance between theseĬrests are 10 meters. Second, they are also going to be 10 meters apart. Second apart, but since they traveled 10 meters in that 1 Well, every second, he'sĮmitting a pulse. Wavelength of, at least this wave right here. Going to perceive? Well, every second he's gettingĪ pulse- well, there's a couple of things Now, let's think a little bitĪbout what the perceived frequency of this wave would beįor a couple of observers. And it should be centeredĪround that point.
So once again, I can just copyĪnd paste this right here. So we're going to beģ0 meters radially outward from this point. But what about this guy? He wasn't here 3 seconds ago. Radially outward, so another 10 meters from the last one. So what about the crest thatĮither of these of sources emitted 3 seconds ago? Well, it would be 30 meters Then is going to be 20 meters radially outward from A second before that, he wasĥ meters more to the left. Now this guy, once again, youĬan't just draw a circle around this because he wasn't Points on the wave that spreads radially outward from If you think of water, a pebbleīeing dropped into the pond, these are just the high So it will look somethingĬrest of the waves. Radially outward from the center, from the source. If he emitted it 2 secondsĪgo, it's traveling at 10 meters per second. That both of these guys emitted 2 seconds ago. So I could draw it a little bit like that. That's where he was 1 secondĪgo, where he emitted this crest that has now traveled Second ago isn't going to be 10 meters from this guy. Radius 10 meters around this guy as well. Guy emitted 1 second ago? You might want to just draw a Now what about this guy? Where's the crest that this Well, let me draw it a littleīit neater like that. So if it emitted it 1 secondĪgo, it's going to be 10 meters radially outward So it's moving outward atġ0 meters per second. Going to be now? Let's think about the stationaryĪ crest 1 second ago. Let's say it emitted a crest of it's a wave exactly If it takes a second for aĬycle, it's also in 1 second, you're also going to see 1Ĭycle, so 1 cycle per second. Wave, as being emitted is going to be the inverse Of the source, I guess you could call it, of the Per cycle, you take the inverse of that- the frequency To be, the wave that they're emitting is atġ0 meters per second. Give you the intuition and make the math really Guy, who is moving to the right at 5 meters per second. Much, much faster than 10 meters per second. You could visualize this, maybe,Īs a sound wave, but sound and air move much, much, Wave is going to be 10 meters per second.
And what we're going to thinkĪbout is where are the crests of the wave that it'sīeen releasing for the last 3 or 4 seconds? So let's say that in both cases, Number, it's moving at 5 meters per second Stationary and the other one is going to be moving. This video is think about two wave sources.
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