This problem was what? Standing waves. Specifically, we're talking about electromagnetic waves which accomplish a standing state. Um, and the way that happens is you have incident waves coming in. They hit some conductor, which is able to reflect the radiation back out. And then the reflected waves interact with the incident. Incoming waves to form a standing state superposition of the incident and the outgoing that is stable. And that's what we call a standing electromagnetic wave. And so what? The question nous here is were given a frequency for this incoming wave, Um, were given that it's 75 75 megahertz, 75 megahertz. So that's the frequency of this radiation coming in. And the question is, how far apart are the nodal planes of these? Um, of the e component and the magnetic field component. And what they mean by nodal plane is what are the places that this component hit zero in the X domain. So I've drawn it out for you here. You can see that every time e that sign of K X equals zero, which corresponds to like, for example, if you have sign of one pie sign of two pi and so on, um that those are gonna be zeros. And so those air what you would consider to be nodal planes, it really doesn't want me to erase that. I guess I'll just do it the old fashioned way. So those are the nodal planes. And so one way you can figure out the distance between these nodal planes is to look at the frequency and say, Well, I mean, I know the frequency. I know that si is equal to f times lambda. So from F, I can get that lambda is equal to 4 m. Okay, so that means that every time ah, one every half wavelength Ah, we get one of these noted planes. So that means that the distance for E between these Notre planes is land over to or if you were to calculate that number, it's gonna be 2 m. Um, Similarly, for this scenario, every time co sign of K X is equal to zero, you'll get a zero down here and that's a no till plane for B. Um and there's also a distance of 2 m or half a wavelength between these Notre planes. And but now the question is what is the distance between a nodal plane, the closest distance between the nodal plane for eat and for be well, the distance between here and here's to the distance between are here and here is to so you can see pretty clearly that the distance between nodal plains of E and B is one 1 m. Because you have one right here and you have one right here. These air to part these air two parts of this is right in the middle, a distance of 1 m.