[VẬT LÝ 12] BUỔI 02: TRỌNG ĐIỂM GIAO THOA SÓNG (Phần 1) - THẦY VŨ NGỌC ANH

Hello everyone, today I will continue to film a video for you to conquer the second school in the 12th grade physics program, which is the mechanical school. So the topic today I film for you is the focus of mechanical interaction and the technique that I teach you today is the technique of processing ABCD squares. With the word ABCD square, there is nothing strange with those who have learned about interaction, right? It's only strange for those who haven't learned about interaction and haven't gone deep into interaction. And those who have learned about interaction, have practiced interaction, then the ABCD square is a type of exercise that you often meet. You meet it from the numbers, the distance, and the number of points, right? So today I teach you the first session on the technique of processing ABCD squares, it is the easiest session. Many people ask me, teacher, can I be good at studying today? I always say that you can't be good right after today. Learning is a process, you need a lot of sessions, right? But today you can be good, but today is a beautiful step, a foundation step, right? In the process of conquering the machine, specifically, the interaction. Here I teach you about the technique of processing ABCD squares. So the basic steps, such as distance calculation or multiplication, I have taught in my science, right? Multiplication is a very important technique, right? To solve the interaction, it is almost the most important technique to solve the machine interaction, right? So I won't mention the multiplication anymore, right? So I will only deal with the ABCD square. In fact, the ABCD square is the easiest shape. Later, people put it on a circle, right? Or any shape, it is difficult. But the square is easy, right? Of course, there are many different questions about the elements that are mixed with the source, mixed with each other. It is a new type of exercise, a difficult exercise of this year. It is a type of exercise that is mixed with the source or mixed with each other. That is, the points are mixed with each other or the points are mixed with the source, right? So those are the difficult exercises. And the basic exercises, right? Here I will teach you the techniques to handle it. Then from these techniques, you can improve the equations that are mixed with the source or mixed with each other, right? So you have to go through the basic equations. And of course, is today's lesson difficult? Today's lesson is difficult, guys. Today's lesson is difficult because today I will teach you the ABCD equation, right? Of course, we will go through the basic equations first. After that, we will go to the next difficult exercise. Ok. Do you see the following sentence? Place two points A and B, two combined sources, with the same frequency, mixed with each other. C and D form the ABCD square. The point C belongs to the extremely large element 2. This is an easy lesson, right? People give you C belongs to the always large element 2. After that, you have to find the point M belongs to the side BC. Interact with the extremely large frequency and find the B-min. Right? You will deal with the point M later. I will deal with the point C first. Our point C belongs to the still large element 2. So our Kc is equal to 2. Is that right? There. First, you make an ABCD square. You set it to show that AB is A. Are all our sides A? And AC is the diagonal, so it will be A square 2. And BC is the square bracket, still A. The side of the point C is the distance factor divided by lambda, right? The distance factor is ACan2-A. The distance factor is 2. ACan2-A, right? Divided by lambda. There. From here, you can easily get the A-lambda. Right? We will have ACan2-1 on our square. Right? So our A, right? It will be 2 lambda divided by Can2-1. Is that right? 2 lambda divided by Can2-1. It will be A. From a simple step, you can get the A-lambda. But not all. People say that M belongs to BC. M is interacting with the extremely large element. So we need to find Mp-min. So you have to understand that M is a point very close to B. Right? Of course, this equation is Mp-lambda. All the solutions here are Mp-lambda. See? M is closest to B. But M is interacting with the extremely large element. So we need to find Mp-min. Mp-min is definitely the original number. But which number is closest to B? We have to find Mp-min. Got it? So how do you find Mp-min? Mp-min is in the formula. Right? In the formula. It is AB divided by lambda. Is that right? AB divided by lambda is A divided by lambda. Got it? Alright. Pay attention to this. You will see a lot of changes between C and B. Got it? Let's define it. C is A divided by 2. Got it? Divided by lambda is 1. Got it? C is the distance. CA divided by CB is lambda. And B is AB divided by lambda. These are the most basic. Right? That we can learn when we start to learn the algebra. Right? And when we learn the technique of solving the equation ABCD, we will learn the alternation of these two sides. Because in fact, in B's side, there is C's side. And it is the same as the opposite. Because C's side, look at this. C's side is B's side divided by 2 divided by 1. Got it? In C's side, there is B's side. It depends on the algebra. In algebra, there is C's side. There is B's side. You can solve it by this way. Got it? Alright. From now on, we have C's side. Got it? Let's move to B's side. It is A divided by lambda. Right? A divided by lambda. Can you see it? It is 2 divided by 2 divided by 1. That's it. What is B's side? It is 2 divided by 2 divided by 1. Got it? B's side is 4.8. Got it? B's side is 4.8. So, M's side is the closest to B's side. Because B's side is min. So, M's side is 4. Right? M's side is 4. B's side is 4.8. Alright. Now, let's find B's side by lambda. The quick formula is taught in science. B's side is L divided by 2K lambda. Right? K lambda divided by 2. In it, L is AB. L is AB. Got it? L is AB. AB is A. Right? K is the magnitude of M. What is the magnitude of M? M is 4. Got it? You set lambda as 1. Got it? You set lambda as 1. L is 2 divided by 2 divided by 1. Got it? In it, L is 2 divided by 2 divided by 1. Right? Lambda is 1. Then, square it. In it, K is 4. K is 4. Right? K is 4. Lambda is 1. Divided by 4 is 2. You get the magnitude of M, B, and min as 0.91 of what? 0.91 of lambda. Got it? So, this is a quick formula. You get the magnitude of C from the magnitude of C. You get the magnitude of B from the magnitude of C. That's the important thing. You get the magnitude of B from the magnitude of C. Got it? This is obvious. Next, you get the magnitude of M from the magnitude of B. Right? This is a very unlucky formula. So, how about the difficult formulas? Right? You can make it difficult right away. For example, you get the magnitude of M from the magnitude of B. You get the magnitude of M from the magnitude of B. You just do the opposite. Got it? The opposite formula is always more difficult. But you just do the unlucky formulas first. Then, when you practice with me, I will give you the opposite formula. You will find it a little more uncomfortable. Got it? But the nature is still the same. Finally, we start the process of calculating. It's nothing. This is just calculation. Got it? See? The next question is still the same. But the condition is a little bit different. At two points A and B, there are two combined waves with the same frequency. C and D form an IBCD. M belongs to the B-C side. It moves with the maximum and nearest magnitude of B. You get the magnitude of M which is 0.8λ. You get the magnitude of M which is nearest to B. You get the magnitude of M which is 0.8λ. Got it? On the side of C and D, there are 5 magnitudes. Here. This is what you need. You need to find AB. I always say that with other numbers, AB may have many values. So this question can be considered as finding the magnitude of AB. I don't know about this one. I just made it up. Got it? I just made it up. So it may have many values of AB. Or it may have one. Got it? Alright. We will do the next question. You haven't figured out the condition of M. Right? As I said, the most important part of the equation of ABCD is that the magnitude of C and magnitude of B are connected. Got it? So for the magnitude of C, you will get the magnitude of B. And vice versa, the magnitude of B will get the magnitude of C. This is very important, guys. Got it? For the magnitude of C, I will write it again. It is a²-dA divided by λ. The magnitude of B is a²-dA Got it? So in the magnitude of C, there is the magnitude of B. kC is equal to kB times the magnitude of 2 minus 1. Got it? This is what I have to write again. Got it? Many of you forgot it. Got it? Alright. So what did they say? On our CD, there are all 5 magnitudes. Right? So for the 5 magnitudes, there is a central magnitude for 1 point. Right? So for 5 points, if there is 1 point, there are 4 points left. So each side will have 2 points. Right? So magnitude 0, magnitude 1, and magnitude 2. That is, the magnitude closest to C is magnitude 2. Right? And the magnitude that can't cut CD is what magnitude? Magnitude 3. Got it? So the magnitude of C is between magnitude 2 and magnitude 3. Right? The magnitude of C is between magnitude 2 and 3. So on our CD, there are 5 magnitudes. Or the magnitude of C is the same as the magnitude of 2. Right? So the magnitude of 2 goes through C. Right? So on our CD, there are still 5 magnitudes. Got it? Right? So you can get the answer that the magnitude of C is bigger than 2 and smaller than 3. The equation is here. Right? So now, let's calculate the magnitude of B. Got it? The magnitude of B is actually A divided by lambda. Got it? It's bigger than and smaller than how much? Now, take the magnitude of C and divide it by magnitude 2 minus 1. Right? The magnitude of C divided by magnitude 2 minus 1 is the magnitude of B. Now, take this. It's between 2 and 3. Right? Take 3 and divide it by magnitude 2 minus 1. Right? The magnitude of C after dividing it by magnitude 2 minus 1 is 7.24. Got it? What about the other side? It's 4.83. Done. This is the magnitude of B in this area. Right? Got it. So now, our equation has become much more basic. Let's continue. Look at this. It says that point M is the closest to B. Do you know the magnitude of B in this area? So, can you calculate the magnitude of point M? Look at this. The magnitude of point M is written like this. Got it? 4, 5, 6, 7. There are 4 values of point M so there will be many values of AB. Right? Why is the magnitude of M 4? For example, the magnitude of B is greater than 4.83. For example, the magnitude of B is 4.9. The magnitude of M is 4. The magnitude of B is 5.2. For example, the magnitude of M is 5. Because the magnitude of M is the closest to the magnitude of B. Right? The magnitude of M is at least 9 to 7. If the magnitude of B is not greater than 7, the magnitude of M is not greater than 7. Got it? Done. So, you have the magnitude of M. What do you calculate? The magnitude of B. So, the magnitude of B is divided by 2Kλ minus 2Kλ divided by 2Kλ divided by 2Kλ. Got it? The most important factor is the magnitude of C divided by the magnitude of B. Got it? Now, you can see the magnitude of B is 0.8. The magnitude of M is 0.8λ. The magnitude of M is 0.8λ. Now, let's substitute in the equation. The equation is the same. Got it? The equation is the same. So, K goes down 4, 5, 6, 7. So, λ goes down 1. Now, let's see what happens with K equals 4. Let's try. Let's write L as A. L is A. L is AB. x² divided by 2 equals 4. Right? So, λ goes down 1. Right? 2 times 4 minus 4 divided by 2 equals 0.8. So, λ goes down 1. See? So, K equals 4. Got it? 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The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B is the magnitude of magnitude 8. The magnitude closest to B