Chapter 420: Particle replacement problem

Xu Mang didn’t want to make trouble in Columbia. The reason why he ran into other people’s classrooms was to see what advanced physics majors in Columbia have as one of the most outstanding majors. If there is one, copy it. come.
No way... it's better to cross the river by touching Yingjiang than by touching the stones.
But what makes Xu Mang regretful is that he didn't get any brand new feelings. Basically, he read it from the textbook, and then analyzed it according to a classic example, and talked about the points of attention. There is no special... What I usually teach is pretty much the same.
Xu Mang felt very regretful about this. He should go to the library to see what the occupancy rate of the library is. Through the analysis of occupancy rate, the teaching quality of this school can basically be judged.
so awkward...
Sitting like this is boring.
Xu Mang is sitting and dying. He is currently teaching the calculation and approximation methods of quantum mechanics. In fact, these things are just like that. The main reason is that he has reached the point where he is so familiar... it makes no sense to listen to these things.
"The movement of molecules is more complicated than that of atoms."
"Molecules involve not only the movement of electrons, but also the movement of atomic nuclei. In the center of mass coordinate system, each nucleus in the molecule vibrates in the vicinity of its equilibrium position." According to the pictures projected by the projector, the professor talked to the students in the audience. Explain the vibration and rotation of molecules.
At this time,
The professor suddenly noticed that one of the more than forty students was in a daze. The most important thing was that he didn't even bring a notepad, so he just sat there in a daze.
Although many students in the university focus on self-study, they either stay in the dormitory to read in their spare time, or stay in the library to read, or conduct research in the laboratory, but the most basic etiquette in class must be achieved.
No textbooks, no notebooks, no pens...what class do you have?
"Ahem!"
"Please pay attention to this classmate." The professor looked at Xu Mang with a serious face and said, "If you don't bring anything next time, then you won't use it for my class."
The sudden reminder was overwhelming. Xu Mang was still silent in the fantasy, and then awakened by the professor. Perplexed and at a loss, Xu Mang nodded. In fact, his behavior was just a subconscious behavior.
The class continued, and did not stop because of this small incident.
"Hey!"
"Sister!" Xu Mang silently approached the blond woman next to him, and said with a smile: "Could you let me share your textbook?"
"No problem." The blonde woman agreed to Xu Mang's request.
This sister is very ordinary, with blond hair and blue eyes, that's the end... But to Xu Mang, it seems that foreign women are like this. Unless those special Hollywood movie stars, Xu Mang can hardly distinguish foreign countries. Female appearance.
"Why have I never seen you? Did you come here to listen?" The blonde girl looked at Xu Mang curiously. There is no Eastern face in this class. It is easy to find one more for no reason.
"what?"
"Yes...I'm listening." Xu Mang nodded.
"Astronomy major?" the blonde woman asked: "Generally, astronomy majors will come to attend the class, but you may be wrong. The theory of relativity is only available on Thursday and Friday."
"Oh..."
"It's okay!" Xu Mang said with a smile, "I am a very easy person to learn."
In the following time,
Xu Mang and the blonde woman talked about some humanities and interesting things, but their voices were very small, and they were basically limited to hearing each other. During the chat, the blonde woman felt very good about Xu Mang, and then she even suggested Go to the cafe after class.
joke,
Xu Mang didn't dare to agree to this request, so he could only sleep on the sofa in this life.
And... I didn't find anything special about this blonde woman. Compared with Audrey Hepburn, it was a far cry.
"Sorry."
"I'm already married." Xu Mang secretly took out his phone to unlock the screen. The screen of the phone was a picture of him and Xiaoman. From the smiles of the two, you can see that the two words were printed on each other's faces.
"..."
"Sorry." The blonde woman was a little embarrassed and said to Xu Mang, "I don't know you are married."
Seeing the blonde woman’s disappointed face, Xu Mang sighed helplessly, and said calmly:
It’s not your fault, it’s my fault, I deliberately concealed my marriage, if I get married This news spreads, and single women all over the world will cry for me."
I...
This...
The blonde woman was confused and her expression gradually became somewhat lost.
"Kathy!"
"Take the structure of carbon dioxide O=C=O, a straight molecule, let the equilibrium distance between two adjacent atoms be a, and the coefficient of elasticity of two adjacent atoms is k, what is the Hamilton mass? You can write about it. expression."
The professor suddenly asked the blond woman who was confused.
The sudden question made the girl even more confused. She had been chatting with Xu Mang just now, and then missed a period of time and space. When she came back to her senses and found that the world had changed, how could the vibration of three-atom linear molecules suddenly occur?
Oops,
totally no idea.
The blonde girl was a little depressed, and even a little scared at the moment, afraid that her credit would be affected.
At this time,
Xu Mang took a pen silently and wrote an equation on the notepad, the general form of the Hamilton quantity, but it was changed according to the carbon dioxide structure.
After writing,
Xu Mang pointed to the equation above.
After seeing the equation written by Xu Mang, the blonde girl of Casey was a little at a loss. She didn't believe that an astronomy student could actually give an answer to such a professional physics problem. This is definitely not reliable.
However, I have no other choice...
finally,
The blonde girl could only walk slowly to the podium according to the equation given by Xu Mang. This short journey of more than ten seconds is a century long in Casey's spiritual world.
The professor didn't think that Casey could write this equation. The reason for letting her go on stage was just to give her a warning, warning not to do something unrelated to the class, such as staring at the boy.
In panic,
Casey wrote down an equation Xu Mang gave her, looked at the professor cautiously, and said, "Professor...OK."
"..."
She will?
Impossible!
Have you previewed this part in advance?
The professor saw that Casey had written the equation without any errors, and was a little confused for a moment.
"Not bad!"
"It seems that you have previewed the approximate method of quantum mechanics in advance." The professor can only follow the words and praise Casey: "Go back."
what?
This... is that right?
No way?
Hearing what the professor said, the girl Casey realized that the boy who was sitting on her own... is the extremely narcissistic boy. He has a deep understanding of physics, and it feels like he doesn’t have much class, even No books.
Confused,
Lost go,
Casey still couldn't understand why the boy could know this equation, and he didn't look like a schoolmaster.
Back to her seat, Casey took a serious look at Xu Mang. This man with an oriental face looked a little... dull and cute, that is, he doesn’t seek improvement, eats and waits for death, and is lazy. With a little bit bad.
look familiar!
Very familiar... vaguely seen somewhere, but just can't remember who he is.
"Who are you anyway?" Casey asked.
"I am me... it's a different firework." Xu Mang smiled and said calmly.
Neuropathy!
Casey directly defined Xu Mang as a neuropathy, and he was not very sick, but... and because of this, he suffered a lot. A problem that even a neuropathy knew, and he didn't even know it, then he was even worse than a neuropathy.
The class is still going on, but Xu Mang can't stand the sleepy bug on his mind. There is no way... he can't walk and he doesn't want to listen. The willpower is almost wiped out at this moment, and sleepiness finally takes over the whole body. Body.
Xu Mang sat and fell asleep.
Very fragrant, very deep and beautiful...
Physical skills +1
Physical skills +1
"When using the variational principle to deal with practical problems, another common method is to approximate the general form of the wave function, and then use the variational principle to find the corresponding energy proof equation." The professor said seriously: "This equation It is much easier than the original wave equation, and in the process of solving..."
Halfway through,
The professor saw a speechless scene in which a student sat down and fell asleep.
but...
At this time, the professor suddenly felt that the sleeping student was familiar.
correct!
Is he Xu Mang?
The professor finally remembered who the sleeping young man was. He had seen his photos several times in the journal Nature.
How could he appear here?
Oh!
The press conference not long ago.
"Hey!"
"Don't go to bed!" Casey hurriedly pushed Xu Mang next to him, and said solemnly: "What's your situation with you? Are you crazy? This is Professor Jeff's quantum mechanics class. You don't want to be in school. Stay here, right?"
Xu Mang woke up with a dull look. He felt that he had made two most regrettable decisions in his life. One was to marry Xiaoman as his wife, and the other was to come to this classroom to listen to the class. This professor named Jeff, There is no tension in the words, a little lifeless.
"This classmate!"
The professor pointed at Xu Mang, and said with a serious face: "Can we use other methods to solve the multi-electron problem in independent particles?"
I...
Nima!
what's the situation?
Xu Mang was in a daze, and then he was called his name. For a while, he felt a little panic. He felt that he had returned to the scumbag period of high school and was suddenly called by the teacher, and then silently walked out of the classroom to stop him.
At this time,
All the students looked at Xu Mang and expressed their deep sympathy to him. This guy is too unlucky.
By the way...
Who is this guy?
How come he has never seen it before, when did he sneak in?
wrong,
A little familiar!
Almost everyone thought Xu Mang was very familiar, but they couldn't remember who he was. Then I thought about it... maybe it's the same face as an oriental.
This is the same as Xu Mang’s perception that Westerners’ faces look like the same. Both sides have entered into the home effect and the alien effect. The faces of the native people are always better recognized than the unfamiliar faces of the aliens~EbookFREE.me~ facing the aliens. Face recognition will be more difficult.
of course,
There are also cross-cultural differences in face and expression recognition.
"This classmate!" the professor said again: "Come up and solve this problem, don't let us wait any longer."
Xu Mang shrank his neck and asked cautiously, "Professor... can you repeat the question again?"
"Using other methods to solve the multi-electron problem in independent particles." The professor said: "And prove the physical meaning."
After hearing the professor's words,
Everyone was stunned. If it is said that the problem is difficult, then it is death.
Also prove the physical meaning...
How can it be done.
......