It is probably gonna talk about frequency and time constant. So let's say that we have a wave that I'm a drive here like this and we plot the empathy of the wave as a function off the time cheap. Mhm. Um, I just write different. That could be It's yes. Here. Okay, so this is the amplitude A Let's say, if we want to calculate the frequency of this way Well, let's say that here we have that the time is equal to three seconds. Um, so we can ask ourselves how we calculate the frequency this way. Well, we have to count how many oscillations there are inside these three seconds. And then the divide, the number of the oscillations by the time. So the frequency is equal to the number of oscillations then divided by time. The time t Now, how many escalations air there inside these three seconds? Ah, here we have one solution. Then we have two and three. So there are three escalations in three seconds. And you know the frequency is equal to three divided by three or one hurts that. Then we're also gonna talk about time constant. So consider that we have a wavelength was an amplitude because his fault a is equal to 30 minus times e to the team to the minus c developmental where tau is called the time Constant. Yeah. Okay, uh, notice also that, uh, this time costs, um, towel can be interpreted as the time necessary for the amplitude to decay by a factor of mhm. So a off T equal Tao is equal to a zero divided by eat. Okay, so now we can go into activities way. Have the wave shown here The figure, Any questions? A. We have to calculate the frequency f. Well, notice that in the 1st 2nd, we have Tom one to three four on. There's actually something wrong here. The one shouldn't be here for that. Um, no one should be here. Okay, so for five oscillations in one second, so the frequency is equal to five divided by one or five hertz, then in question. Do you have to calculate the time constant? Be town Khost. Tell I'm sorry. Eso basically notice that a is equal to five units 12345 and ah, a equal to a zero. Divided by e is equal to five units divided by, and this is approximately 1.8. So we have to, uh, in order to find how you have to see at what time? The attitude the case to 1.8 units. So basically, uh, what time? 1.8 is approximately here. So at what time? The frequency that pleased 1.8. And we can see that it's approximately at two milliseconds. Okay, actually, here in Rhode five herds, it's actually going to be a little more specific. The frequency is equal to five oscillations, divided by one milliseconds. So this is actually 5000 hertz five que hurts for For that eso the time constant is equal to two milliseconds, and this concludes our exercise.