The black Audi drove into the gate of Peking University and slowly stopped in the open space in front of the office building.
The rear door opened, and two wooden-faced "security" personnel came out first. After quickly scanning the surroundings, they stepped aside and allowed Zhou Xing to get out of the car.
Zhou Xing got out of the car door and immediately saw three or four people surrounding Director Zheng, walking towards him with smiles.
"Haha, long time no see, Zhou Xing!" Director Zheng reached out excitedly to shake Zhou Xing's hand.
"Don't come close!" A security guard stood up and stopped him, warning him.
Hearing this, Director Zheng's face froze.
"It's okay, it's safe. Get out of the way." Zhou Xing ordered with a smile.
After hearing the order, the security guard stepped aside, but his emotionless eyes were still on Director Zheng. As long as he did anything wrong, he would stop him.
"I have to trouble you again, Director Zheng!" Zhou Xing smiled sheepishly and held Director Zheng's hand.
"Haha, you're so polite, you're so polite! Aren't you still a student at Peking University? Even though the situation is a bit special, Professor Li and the others are quite happy to teach and answer questions. Especially after hearing that it was you, they were very happy." Director Zheng smiled and waved his hands repeatedly.
"Yeah, trouble!" Zhou Xing smiled and nodded.
"Well, I specially arranged a classroom for you." Director Zheng made an invitation gesture and guided Zhou Xing.
Zhou Xing nodded and followed Director Zheng's footsteps towards the classroom where Director Zheng mentioned.
"Xiao Xing! Which direction are you planning to develop this time? Is it a physics problem this time?" Director Zheng led Zhou Xing to the classroom and asked curiously.
"Haha, I don't plan to develop anything, so I'm going to ask a few professors about learning problems." Zhou Xing explained with a smile.
"Little Anxiously explained to Zhou Xing.
"I know, it's all in the past. If you still care, I won't go back to school!" Zhou Xing smiled and shook his head.
Hearing this, Director Zheng immediately breathed a sigh of relief.
Director Zheng's eyes showed firmness as he looked at Zhou Xing and vowed: "Yes, then I won't get to the bottom of it! Xiaoxing! The door of the school will always be open for you. Whatever difficulties you encounter, you can try to solve the problem." Come here."
Zhou Xing nodded, showed a happy smile, and said with a smile: "Thank you, director. As you just said, I am still a part of the school. If I have the opportunity, I will continue to bring glory to the school."
Director Zheng's eyes lit up and he was very happy. Zhou Xing's words were equivalent to acknowledging the "deal" between them. No matter what Zhou Xing wanted to do, Peking University would be able to get some light.
Soon, Director Zheng took Zhou Xing to a lecture theater.
The door to the classroom was open. When they heard the sound of footsteps, four old professors of different heights and extraordinary temperaments stopped their discussion and turned their heads.
"This is Professor Li Jing, graduated from Columbia University: First-level subject teaching: Physics, Second-level subject teaching: Condensed Matter Physics, Main research directions and characteristics: Magnetic nanostructures and low-dimensional physics Magnetoelectronics Magnetism and magnetic materials " Director Zheng introduced, pointing to a middle-aged man in his fifties, with a bun-shaped face and a tall figure.
"This is Professor Xu Wen, a graduate of Bielefeld University. First-level teaching: computational physics, second-level teaching subject: lattice QCD... Main research direction: lattice quantum field theory."
"This is Professor Zhang Hua..."
"This is Professor Chen Yuxin..."
Director Zheng introduced four professors to Zhou Xing one after another. Then he looked at the four professors and introduced Zhou Xing next to him with a smile: "Professors, you must all know the person next to me!"
"I know him, of course I know him! I have only heard of his name but never seen him in person, but now I finally meet him in person!"
"I didn't expect that the super little genius would enter the field of physics! Welcome, we warmly welcome you."
"Haha, I have been waiting for you day and night, and finally you are here!"
"Yes! Yes! Classmate Zhou, if you don't take the road to heaven, you have to break through the physics gate. This level will not be easy to pass!"
Hearing this, the four professors looked at Zhou Xing with bright eyes, and expressed their opinions with big nods.
"Professors, student Zhou Xing would like to say hello to you and ask for your advice." Zhou Xing greeted the four professors with a smile.
"Don't be polite when you give me advice! If you have any questions, we can discuss them." Professor Xu Wen said with a smile.
"That's right, that's right. Lao Yan and the others have publicized your deeds a lot, so don't act like a big-tailed wolf!" Professor Li Jing revealed with a smile.
"Haha! That's right, that's right! There's no need to mention the advice, otherwise you won't be able to get off the stage when you ask. That would be too embarrassing!" Professor Chen Yuxin laughed and nodded repeatedly.
There is no falsehood under the famous name. Zhou Xing's reputation is world-renowned. His intelligence, knowledge, and research ability must be extraordinary. The professors looked at Zhou Xing with smiles on their faces, and they all did not dare to accept his greeting.
"Professor, you are overestimating me." Zhou Xing smiled, unwilling to remain polite, and changed the subject: "Professor, I encountered a special problem when I was studying physics, and I would like to ask you for advice."
"Um?"
"go ahead!"
"what is the problem?"
"what is the problem?"
The four professors looked at Zhou Xing with solemn expressions, and responded in unison:
"Evolutionary Mechanics: Speed in physics is relative, and each speed value must be relative to a specific reference object. For example, for a ship traveling down the river, the speed of the river relative to the river bank is 3 meters/second. The speed of the river is 4 meters/second, so the speed of the ship relative to the river bank is 7 meters/second." Zhou Xing said lightly.
"Yes, this is the basic point of view of physics." Professor Li Jing nodded.
"The speed of light is about 300,000 kilometers/second. Why does physics think that this speed value is relative to 'any inertial system'?" Zhou Xing asked puzzledly.
"This is a basic assumption of the special theory of relativity." Professor Xu Wen said with a frown.
"This basic assumption is contradictory to the concept of speed in physics. Why do you accept such an assumption?" Zhou Xing looked at the four professors and asked even more puzzled.
"There is no way. If we don't accept this point of view, there will be serious contradictions in physics?" Li Jing sighed and said helplessly.
"What serious conflicts will there be?" Zhou Xing asked.
“In physics before the special theory of relativity, it was necessary to require the existence of an absolutely stationary frame of reference (referred to as the absolute stationary frame, absolute space, or absolutely stationary ether). However, a large number of experiments could not prove the existence of this absolutely stationary frame. This is It’s a serious contradiction.” Professor Xu Wen said.
"The speed of physics is relative. The speed of the same object will have different speed values relative to different reference systems. Speed in physics does not have to rely on an absolute stationary frame."
"Yes. However, the 'acceleration' in Newtonian mechanics is absolute, and the 'certain speeds' in electromagnetism and electrodynamics are also absolute. They must rely on an 'absolute stationary system'."
"Let's not discuss electromagnetism and electrodynamics for the moment. Let's talk about 'acceleration' in Newtonian mechanics first. Why is 'acceleration' in Newtonian mechanics said to be absolute?"
“…”
After a while, Zhou Xing and the four professors entered into a learning state of discussing the field of physics. Director Zheng and others who followed were dumbfounded.