This may be regarded as Ye Hua's first time teaching students in his life, but he was able to do it with ease. In fact, it was similar to introducing a product at a press conference, with some differences.
Ye Hua did not teach these students too much esoteric knowledge. That is what doctoral students should do, so as not to hit them too hard. These knowledge points are indeed difficult. To understand them thoroughly, you need to master more other knowledge.
knowledge will do.
"It doesn't matter if you don't understand. I will study it systematically in the future. Just leave an impression today." Ye Hua listed a formula on the holographic screen, stared at the image and said: "Maxwell's equations describing the electromagnetic field are the first in physics.
A field theory, he said, the fluctuation of the electromagnetic field will produce electromagnetic waves, and he also calculated the theoretical speed of electromagnetic waves, and then found that it was very close to the speed of light measured by people at that time, so he predicted that light is also a kind of electromagnetic wave. See
Well, this is a great god-level person."
It caused an uproar in the physics community at that time, and it can be said to be very sensational. Today, everyone knows it, and ordinary people know it.
"In other words, light is also the vibration result of the electromagnetic field. What does this mean?" Ye Hua looked back at several students. They all listened to the teacher's lectures attentively, and none of them deserted. Ye Hua was very satisfied with this. If
Someone will be very angry if they desert. Maybe this is a "common problem" among teachers, who always pay attention to it.
"Students, you can imagine and use your own brainstorming. What will happen if you hold a charge and vibrate it up and down?" Seeing them thinking, Ye Hua gave them a while before continuing:
"When you shake the charge, it is equivalent to pulling a point on a calm water surface to vibrate up and down, which will cause ripples in the electromagnetic field."
"Just like water waves!" Li Zhengtao said.
"Yes!" Ye Hua nodded: "So what is the consequence? Of course, electromagnetic waves are produced. When the frequency of this electromagnetic wave falls within the range of visible light, visible light is produced."
Seeing them continue to look at him, Ye Hua knew that they completely understood, otherwise they would think suspiciously.
Ye Hua brought up a picture of a light bulb to illustrate and said: "For example, if this lamp is energized, the current will heat the filament. Once heated, the atoms and electrons inside will be disturbed, and this disturbance will stimulate the filament."
The electromagnetic field fluctuates, thus producing electromagnetic waves, and the frequency of this electromagnetic wave falls within the visible light range, thus producing visible light, thus we know why the light bulb lights up.”
Having said this, Ye Hua once again brought up a simulation diagram of the interrotation of a binary star system in the universe: "Similarly, we can make an extension, and we can understand gravitational waves. Theoretically, if you vibrate any object with mass, it will produce
The fluctuations in the gravitational field are only so weak that they are almost non-existent. However, the mass of the cosmic objects is large enough. The gravitational field fluctuations generated by the collapse of the binary stars into black holes will cause the entire space-time to deform like waves, which will of course produce visible
Observed gravitational waves, of course, even so, we need to use professional instruments to detect them.”
Ye Hua walked away:
"Then draw inferences from one example and extend it to the stagnation field theory. The virtual propagation field generator will produce fluctuations in the stasis quantity field, and then the interaction will be transmitted through the gauge boson, which is the so-called stasis quantum. It doesn't matter what it is called.
, according to the classification of particles, stasis quantum should belong to a new type of boson. So students, even if they have not studied quantum mechanics in depth, they should have heard of wave-particle duality, which means that matter is both a particle and a particle.
A wave is actually a kind of field, no matter how you call it, the field is the particle, the particle is the field, and the field also has spin."
The young geniuses here are gradually confused. They seemed to have no pressure before, but now they are gradually becoming autistic.
Ye Hua looked at their expressions and raised his lips slightly, and soon his eyes fell on Li Zhengtao: "If you want to become a physicist, an excellent physicist, you must master these knowledge in the future, including stasis field theory."
"Then stasis field theory is established on the framework of Yang-Mills gauge field + Higgs mechanism. Naturally, quantum mechanics cannot be circumvented. From the name, we know that it is not only unavoidable but also critical. In the paper
The qcd theory of quantum chromodynamics was introduced for description. As for the qcd theory, it is simply a standard dynamic theory that describes the strong interaction between quarks. This will be studied systematically in the future."
"In other words, it is the maintenance of the quark model. The stagnation field model will definitely become an extremely important part of the standard model of particle physics in the future, so this is a required course."
The eight Guanhua class students present here don’t know what Ye Hua’s words mean, but if there are graduate students or postgraduate entrance examination party members here who hear it, they will probably collapse in their hearts, and they will definitely have full resentment against Ye Hua.
Especially students majoring in particle physics.
The mountains erected by the big guys in the 20th century are becoming more and more difficult to climb. Now another mountain has emerged?
When you wake up, you need to master a brand new knowledge point, and it is at this heavenly level? What's more terrible is that before you can master stasis field theory, you must master a lot of fairy-level knowledge points of the same level, quantum chromodynamics qcd
The theory is a gauge theory, and its gauge symmetry group is su(3), so you need to master the mathematical knowledge point "group theory" to understand the description of the quark model, and the Yang-Mills theory...etc!
"Then the question is, teacher, what is a field?" Lorentis Ross seemed to be upright, blinking and looking at Ye Hua, with a look of desire for knowledge.
Ye Hua coughed a few times, glanced at Lorantes, and said lightly:
"This question itself is not a good one, but it is a good one. Because of this, people in the 19th century proposed the concept of ether. The main reason was to concretize the field. Now we know that the proof has come out. The matter of ether
Does not exist. Whether the field exists or not is important, but what the field is is not important. Now we know that the field exists. It is completely correct to use mathematics to describe the field. It is also correct to prove it with experiments, and the field is indeed very useful.
, so when you encounter a problem and need to introduce the concept of field, you only need to understand in your heart that there is a field here, and that is enough."
Ye Hua did not teach them further. It is too early for them to learn these knowledge points now. It is useless to teach them without any preparation. Even if the talent is far beyond ordinary people, it still needs a process of acceptance.
.
Just leave an impression on them. It is not an easy task to teach, educate people, preach, and solve problems, especially these teenagers. You also need to guide them to grow up healthily.
To recruit them, one must not only be responsible for their studies, life, and growth, but also be responsible for their parents. A child like Ning Jie comes from the Hexi Corridor in the northwest, thousands of miles away from his hometown in Saibei.
And they are all in the teenage stage. Compared with ordinary college students, they are not yet able to live independently.
But having said that, Ye Hua did not care for them as if they were greenhouse flowers in an ivory tower. Xiao Liu was the life instructor in charge of the first batch of students in Guanhua class. During this period, school did not start, and he basically organized them to carry out some sports.
Military training activities, outdoor activities, and mainly guiding their independence in life.
