Xueba, I beg you to go and escort him quickly!

Xu Heng looked at Fang Zhonggui, "Professor Fang, I have a question."

"I have also participated in the production of many test papers, but this is the first time I have encountered such a situation!"

"Some people have a big opinion on me?"

Fang Zhonggui, "Actually, I invited you to come out to produce the paper, and I want you to be the team leader of the paper group. Naturally, this will offend some people!"

"I won't say much about the pros and cons of this!"

"But after today, some people may not show up the next day, so everything will be fine!"

Xu Heng raised his eyebrows and smiled, "Professor Fang, you still want me to continue with salty fish?"

Fang Zhonggui looked at Xu Heng and asked, "If you don't have salted fish, you can finish a set of test papers tomorrow morning. For the rest of our days, should we follow Xianyu together?"

Makes sense!

So Xu Heng is well versed in this, and has been salting fish until the last day.

When the test papers were mixed and everyone felt that the last big question was inappropriate, Xu Heng slowly walked towards the blackboard.

In the past few days, in the eyes of everyone, Xu Heng is an active group that eases the pressure and adjusts the atmosphere.

They almost forgot where Xu Heng's strength lies.

When Xu Heng went to the blackboard to write down a question about quantum mechanics, the paper production team was quiet on the spot.

topic:

It is known that 5 identical particles with a spin of 1 and a mass of m are in a circle with a radius R on a plane, and these 5 particles form a regular pentagon, and the 5 particles rotate around the axis passing through the center of the circle to form a Turn the system.

(1) Write down the Hamiltonian of the above system, and discuss the conserved quantities.

(2) Calculate the eigenvalues ​​and eigenfunctions of the above system.

Xu Heng put down the chalk and looked at the crowd.

The professors in front of them frowned and were very serious.

Xu Heng, "???"

"Professors, what do you think of this question?"

Be quiet for three seconds!

after that……

"Okay! This question is very good! Very good! Just this question!"

"What's everyone's opinion?"

"Okay! Very good! This question is very OK!"

"Okay! That's it! Just this question!"

"I think this question is very elegant! There is no problem! As the finale question, it is the most suitable!"

"Student Xu Heng, what's in your little head! It's too amazing!"

"..."

Faced with the pursuit of a group of professors and teachers, Xu Heng made a perfect end to the test paper for this postgraduate entrance examination.

When leaving Peking University, a group of people sent each other off!

Except for the principal, all the people who came to greet him before are now here.

Dean Nie personally arranged for someone to send Xu Heng back, but Wen Ruohuai borrowed him before he left!

"Xu Heng, I know you're going to prepare for the midterm exam! I happen to be going to Yunshan too, let's go together!"

With Wen Ruohuai by his side, Xu Heng will not be lonely on this journey.

Wen Ruohuai, "Xu Heng, you basically didn't study much this semester, did you?"

Xu Heng smiled, and asked Wen Ruohuai, "Mr. Wen, what kind of study are you talking about?"

Wen Ruohuai was speechless for a moment, "Uh..."

Seeing Wen Ruohuai deflated, Xu Heng smiled.

Wen Ruohuai shrugged helplessly, "Okay! I am talking too much!"

When it comes to the midterm exam, Xu Heng really feels like he hasn't seen it for a long time.

"It feels like I haven't taken the exam for a long time!"

Several months have passed since the final exam years ago, and Xu Heng hasn't taken any final exams yet!

Going back this time, he really wanted to...try again.

Looking out the window, Xu Heng looked at the green belt passing by.

"Whoosh whoosh..."

The corners of Xu Heng's mouth were drawn.

Wen Ruohuai looked at Xu Heng and couldn't help discussing with him, "Xu Heng, how much do you know about "The Picture of Five Bulls"?"

……

PS: Thank you [Yu Sheng for You] for your support!

Kneel for all support!

The last chapter has been revised, you can read it! .