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Both of them were sweating profusely after playing badminton for an hour in the table tennis hall.

Huh~ It's indeed more interesting than doing exercises.

Compared with doing exercises for the elderly.

Competitive sports like badminton are indeed more interesting.

Lou Song knew that Xu You usually didn't play badminton, and instead of using his full strength, he tried to feed Xu You the ball as much as possible.

Otherwise, Xu You probably wouldn't be able to catch a single ball.

Taking a look at the system interface, Xu You found that the fatigue level had almost been cleared.

It's really a good way to relax. It can not only exercise the body, relax the mind, but also move the cervical spine.

For students with a lot of pressure on the cervical spine, badminton is indeed a very good sport.

Xu You had to sigh that Lou Song's way of relaxing was more unique than Hu Shucheng's.

...

Although there are not many ups and downs in the auditor's life at Ji University, every day is very fulfilling.

Xu You's various abilities are also steadily improving.

On this day, Xu You came to the classroom to attend class as usual.

This class is an atomic physics class, taught by Professor Wang Xiangwu from Ji University Institute of Physics and Technology.

This is a teacher Xu You likes very much.

Not only is he knowledgeable, but his lectures are not limited to textbooks.

It will also often expand some relevant extracurricular knowledge.

Let me tell you something. Recently, our research group at Ji University and the University of Connecticut have jointly researched a new result. For the first time, lattice quantum chromodynamics, that is, lattice QCD, is used to study the Lamb shift of hydrogen atoms. , successfully obtained the correction of the Lamb shift by the two-photon exchange.

Listening to Wang Xiangwu's words, everyone looked confused.

Even Xu You didn't know what Wang Xiangwu meant.

Although except for Xu You, everyone is an undergraduate student of the Academy of Physics.

But obviously he hasn't been exposed to scientific research yet, so he doesn't know what Wang Xiangwu is talking about.

I know everyone must be confused. But it doesn't matter, I will explain it to you in a more popular way.

Immediately afterwards, Wang Xiangwu abandoned those professional terms and terms, and tried to explain in a way that undergraduates could understand.

In Wang Xiangwu's more popular explanation, Xu You probably understood the meaning.

Simply put, it is through a more advanced method to measure the size of the proton with higher accuracy.

In the new long-range subtraction scheme, we relied on the Tianhe-3 supercomputer of Huaxia Supercomputing Jincheng Center to help us realize the grid point calculation of the two-photon graph for the first time. This makes our calculation more systematic and more accurate. high.

Listening to Wang Xiangwu's narration, Xu You couldn't help being proud of Huaxia's technological development.

Over the past few decades, relying on the unyielding efforts of the people, Huaxia has achieved breakthrough results in many fields.

Even in many respects, Huaxia is still in a backward situation.

But in the coming decades, everything can hopefully be reversed.

I tell you this news, not just to let you know the facts. If possible, I hope you can also calculate this problem yourself.

Hearing Wang Xiangwu's words, the students couldn't help being a little surprised.

Isn't this the result calculated by a supercomputer?

Ordinary students, without supercomputers, how can they calculate such a huge amount of data?

Of course, it is definitely not for you to calculate such accurate data. Now I will provide you with some basic information, and you can use it as a problem to calculate. Of course, this is an open problem. There is no accurate result. Only more precise precision values.

As he spoke, Wang Xiangwu showed a picture on the projector.

On the picture, various data such as wavelength, frequency, and energy required for calculation are included.

After you go back, you can calculate the final result based on these data. This is not a compulsory homework. If anyone does it, you can send it to my mailbox.

Even if it is only a rough calculation, it is already a super-class topic for these undergraduates.

But there are still many students who take this picture with their mobile phones and try to make it when they go back.

This is the learning atmosphere of Jida University.

Everyone has strong self-control, and there is no need for the teacher to ask for anything.

Xu You also hurriedly took this picture, and was going to go back and study it carefully.

Although Xu You had accumulated a lot of college physics knowledge through the study of Wujing before.

But after all, there is still a difference between competition knowledge and university knowledge.

Compared with these real undergraduates, Xu You still put himself in a low profile.

In the evening, after finishing all the classes, Xu You returned to the dormitory and concentrated on studying this topic.

Physics homework? Looks like fun.

Well, a topic left by the professor is said to be a bit out of class, but I want to challenge it. Do you want to try it too?

Lou Song waved his hands when he heard the words.

I only know a little about physics, but I can't understand it if it's too profound. I have to memorize various theories and formulas, so let's forget it. But if it involves some mathematical knowledge, we can discuss it together.

Well, then I'll do my own research first.

Next, Xu You turned on the deep learning state and devoted himself to researching this topic.

In fact, what the question ultimately asks for is the distribution radius inside the proton.

As we all know, proton is one of the basic particles that constitute the material world.

But inside the proton, there is actually a complex structure.

Inside it is composed of charged quarks and uncharged gluons.

Usually we think that the charge distribution radius inside the proton is the size of the proton.

In order to simplify the topic, Wang Xiangwu directly provided some data that needs to be measured.

After some research and thinking, Xu You finally had a calculation idea.

This calculation should be a rough result.

After completing this series of calculations, Xu You felt a little strange.

For some reason, Xu You always felt that this question should not be so simple.

After comparing with the calculation results of super-calculation and high precision.

Xu You found that the error was still a bit big.

Could it be that...Professor Wang wants the accuracy of our calculations to be more than just rough?

Suddenly, Xu You recalled a sentence Wang Xiangwu said in class.

The charge distribution inside the proton will have a slight impact on the energy level of the hydrogen atom.

Although such an effect is small, it is a non-negligible error for high-precision calculations.

Understood. This energy level data is actually inaccurate!

At this moment, Xu You couldn't help but a smile appeared on his face.

Professor Wang's topic is really enchanting and interesting.