At 4 o'clock, Lin Yujing, Li Zheng and Jiang Qinghua took their respective books and entered the physics teaching and research group.

Lin Yujing is in front, and Li Zheng and Jiang Qinghua are in the back.

The principle of the alliance is very simple, solve the physical problem internally, don't be despised by Lin Yujing, and don't give her a chance.

Tao Feifei had also been prepared for a long time, and when she saw the three of them coming, she directly threw a key and a stack of nailed materials to Lin Yujing.

"These are a few experimental questions, you go to the laboratory to prepare first, and I'll go over after explaining to them. ”

Lin Yujing didn't reach out to pick it up, but only said with her hands behind her back: "I want to do the real question today." ”

"Oh......" Tao Feifei also only spread his hands, "It's okay, you can be happy." ”

There is no way, she can only do this to Lin Yujing.

Not only her, but even among all the people she knows, there are only a handful of people who can guide Lin Yujing.

As for herself, she also crossed the river by feeling the stones, and more often than not, she was not teaching Lin Yujing, but existed as a "problem collector".

Tao Feifei sat down and shook the mouse to turn on the computer, and asked a little ridiculously: "Preliminaries, semi-finals, finals, IPHO, Russia, what flavor do you want to set this time?"

"Both...... It's all right......" Lin Yujing was a little embarrassed, with stationery on the table next to her, and glanced at Li Zheng and Jiang Qinghua: "What about them?"

"They have to talk about it alone. Tao Feifei twisted the chair, turned to look at Li Zheng and Jiang Qinghua shrunk in the corner, and swallowed and spit, "You two...... What are you doing hiding so far away?"

"Cold. Jiang Qinghua didn't dare to look directly at Tao Feifei.

"Well, it's close to the heating. Li Zheng nodded.

After all, Tao Feifei is a physics teacher, and he would not choose this job if he didn't have some IQ.

Obviously, Li Zheng and Jiang Qinghua knew the terrifying gap between themselves and Lin Yujing, and they were very cautious about even physical proximity.

Tao Feifei didn't say much, only raised her glasses and smiled slightly.

"Let's talk about them one by one. ”

"Qinghua's goal now is to qualify for the preliminaries, and I suggest that you still do the preliminaries papers. ”

"Why don't you do it too, Li Zheng?"

"Yes. Li Zheng raised his hand and said, "But I've done it for nearly 10 years, if I have to do it, I'll do it before 08 years......"

“？？？”

Tao Feifei, Lin Yujing and Jiang Qinghua panicked at the same time.

"Hmm! and say you're not prepared?" Lin Yujing was the first to scold.

Said to let two months, lie!

"Not what you think. Li Zheng hurriedly raised his hand, his expression unconsciously sad, "During that time, I did physics problems purely as a vent, and in the last week of the training camp, I did read some competition textbooks a little, otherwise I would not have the courage to face the next day." ”

Tao Feifei and Jiang Qinghua naturally couldn't understand these words.

But Lin Yujing can taste the taste.

Imagine if you locked her up in one place and did chemistry problems for 24 days.

I'm afraid I'm crazy.

Tao Feifei's face was full of surprise, obviously not quite convinced: "There are not only national papers in the preliminaries, sometimes each province will also produce their own papers, how can there be hundreds of sets of papers in the past ten years, and you have done them all?"

"Basically everything you can find on the Internet has been done. Li Zheng replied truthfully.

“…… Well, worthy of you. Tao Feifei smiled bitterly, and then asked, "Then how many points can you get by doing the preliminaries now?"

Hearing this question, Li Zheng first examined the score.

[Physics: 207]

This is the result of taking Zhang Xiaoke's physical supplies after doing those preliminaries papers.

As for how many points you can get for this, I can't say for sure.

"I don't know...... It should be above 130. Li Zheng gave a cautious prediction.

"In that case...... You still have to do the semi-final papers, the questions before 08 are too old. Tao Feifei said and searched for exercises on the computer, "Qinghua, you are still ......"

"Then I'll try the semi-final paper too, and challenge it once in a while. While Jiang Qinghua spoke, he and Li Zheng winked, and the true brothers advanced and retreated together.

"It's okay......" Tao Feifei didn't object, just pursed her lips and shook her head.

It's almost time to strike at Jiang Qinghua.

After all, the level of Jiang Qinghua and Lin Yujing is not in the same dimension at all.

Suppose Jiang Qinghua's physical level is 50.

So Lin Yujing's level, whether it is 500 or 500,000, is just as incomprehensible to Jiang Qinghua.

There is no way for Jiang Qinghua to recognize his strength at all.

Now Li Zheng, who has been immersed in Huajing for several months, is back, and he is used as a reference to let Jiang Qinghua recognize that he is just right.

Tao Feifei didn't look down on Jiang Qinghua, mainly for ordinary students, it was too unwise to invest their energy in the competition, and they would retreat early and be down-to-earth.

Tao Feifei searched for a suitable test paper and asked casually: "Yu Jing will also do the semi-final together?"

"Hmm. ”

Lin Yujing instantly lost her speech function, entered a state of combat readiness, took out her beloved light blue signature pen, unscrewed it and checked the height of the pen.

Seeing this, Li Zheng only scolded in his heart.

What Lin Yujing is doing now is equivalent to arming the battleship with all its weapons, just to engage the fishing gang's boats.

Is it necessary to be so serious?

Isn't it just that I didn't do as well as I did in the preliminary round?

It's really narrow-minded, City Lord Ye.

Li Zheng originally had just improved his attitude towards Lin Yujing because of the co-performance.

At this time, it was again put into combat readiness.

No doubt.

Next, there is the war.

Every time I do the same set of questions with Lin Yujing, it's all war.

When it comes to official competitions, Li Zheng will not start thinking faster.

Because it's a race for honor.

But in the face of the war with Lin Yujing, no matter how many times, he will do whatever it takes.

In the face of war, no one will be merciful.

Soon, three hot rolls rolled out of the printer.

Tao Feifei explained while dividing the packaging.

"Li Zheng just came, let me talk about the competition process again, there are still some differences between physical competition and chemical competition. ”

"First, the number of participants is very large, and the intensity of the competition is much higher than that of the competition. ”

"The preliminaries that will start in April next year can be signed up for, we Jijing generally come up with their own preliminaries questions, which is slightly more difficult than the college entrance examination, but it will not be too difficult, Li Zheng, you have done a lot of sets, I believe you already understand. ”

"After the preliminaries, the Jijing Physics Society will select 5%-8% of the people to enter the semi-finals according to the specific number of applicants. ”

"The theoretical part of the semi-final is a national unified examination, and after the restructuring last year, the full score of the theoretical test is 320 points. ”

"It should be noted that the semi-finals are much more difficult than the preliminary rounds, so to speak—the preliminary rounds are just to select people who study physics seriously, while the semi-finals are to select people with a talent in physics. ”

"Among them, those who rank in the top 70 or so in theoretical results can enter the experimental stage and compete for the qualification of provincial first and final. ”

"Generally speaking, the top 50 or so will get the provincial one, and the top 20 or so can enter the provincial team. ”

"After that, the national finals and the national team training camp are probably the same as the chemical competition. ”

Among them, the top five in the training assessment will represent our country to participate in the IPHO. ”

"The sixth to thirteenth places will represent our country in the APHO, that is, the Asian Physics Olympiad. ”

"The members of these two national teams are not limited to regions, they are all from one school and one class. ”

"Li Zheng, do you have any questions here?"

Li Zheng had already heard it with excitement.

is worthy of being a physics teacher, and he said it much more clearly than Yu Hong and Sun Leyang.

At the same time, he was a little flustered.

I inexplicably feel that the farthest distance is not the first country and the third province.

Instead, I go to IPhO, and you go to APhO......

Of course, he also has some problems.

Li Zheng immediately asked: "That is to say, the members of the Jijing Provincial Team will be decided directly according to the results of the semi-finals, and there is no need for training and selection?"

Tao Feifei nodded and said: "That's right, the part of the experiment has been inspected in the semi-finals, and it will no longer be investigated, but there will still be training camps, and they generally participate, and occasionally there are people who are too strong, and there is no way to take him if he doesn't participate." ”

"Hmm. Lin Yujing shook her legs again when she heard this, "It's better to be physical." ”

"It's a quiet place. Jiang Qinghua sighed against the heater, "My goal is more realistic, it would be nice to be able to save three." ”

Tao Feifei raised her glasses when she heard this, and her tone became serious.

"It's not easy to save three. ”

"This, but physics. ”

"Take, for example, the set of questions we just printed. ”

"First of all, the difficulty of the semi-final questions is already extremely high, and the ups and downs are very large, converted into a 100-point system, when it is low, the first place in the city may be less than 60 points, and when it is high, it can occasionally have 80 points, and it can reach 90 points, which is already very rare. ”

"As for the set you are about to do, it is the 32nd semi-final question in 2015. ”

"The difficulty of this set of questions is low, probably ranking second to last in recent years. ”

"At that time, there was no reform, and the full score of this set of theoretical questions was 160. ”

"For the sake of convenience, I'll convert it to a 100-point scale for all of you. ”

"At that time, it was the first in the city, about 68.12 points on a 100-point scale, and if you don't count the experiment, the provincial one was about 46.87 points. ”

"I don't know if I'm the first in the country, and I probably won't have more than 75 points. ”

With little stumbling, Tao Feifei converted the score of the 160-point scale into a 100-point scale.

Although it is not a complicated calculation, this mental arithmetic ability can also be seen.

In the blink of an eye, she had divided the paper into three parts, supplemented by two sheets of answer sheets and two sheets of scratch paper.

"Still have questions?" asked Tao Feifei finally.

"Yes. Jiang Qinghua suddenly raised his hand, "This ...... How much is the third line of the province?"

"This ...... Nobody cares......" Tao Feifei scratched his head, "Ten and twenty points? That's pretty much it." ”

"Understood. Jiang Qinghua said, and also took out his calculator, "I'm just going towards 20 points." ”

Li Zheng looked at Jiang Qinghua, who seemed to be very determined, and for some reason, he saw the former teacher Mengxi in a trance.

If you talk like that at the beginning, the score will likely be in the single digits......

Tao Feifei didn't want to hit Jiang Qinghua either, so she got up and launched the test papers, and pushed it to Lin Yujing as soon as she came up: "Yujing, my expectation for you is 65 points, this score can guarantee you to enter the provincial team, not to mention that there are still four months to review." ”

"Hmm. Lin Yujing took the test paper, was engrossed, and her language ability further left her.

After that, Tao Feifei gave the second volume to Li Zheng: "Li Zheng, this paper has entered the talent selection stage, considering that you have not yet started systematic competition study, my requirement for you is 35 points, as long as you are higher than this score now, I have the confidence to take you to the provincial team." ”

"Go all out!" Li Zheng could already hear the fire in his nostrils.

Damn, it's worthy of Teacher Tao, what he said is much more domineering than Lao Sun.

35 points is right?

Lao Tzu has been messing around for so long, and he has to fight for this shameful score?

Come on, let's see how sadistic this question is.

In the end, Tao Feifei sent the third volume to Jiang Qinghua.

"20 points is too difficult, 14 points, 14 points, let's rush to save three. ”

"Okay!" Jiang Qinghua pulled out his pen excitedly.

"If it's less than 14 points...... Tao Feifei secretly raised his glasses, "I hope you will quickly devote yourself to the college entrance examination review, and stop thinking about the competition." ”

"Ah......" Jiang Qinghua sighed softly.

Only then did I realize it.

It turns out the real purpose of this exam.

It is to dissuade oneself.

Jiang Qinghua couldn't help but blush.

My two months of study, is it so unbearable, Mr. Tao?

I've turned over all the Russian demon questions.

, no.

14 points.

With 14 points, there's always a way to get it.

In this regard, the three of them in order to "crush Li Zheng and determine their absolute status", in order to "win more victories in the war with Lin Yujing", and in order to "prove themselves".

At the same time, the tense answering questions were launched.

For a moment, all that was left in the office was the sound of paper kneading.

Tao Feifei didn't care about this, so she went to refill the tea.

In the office, Li Zheng did not hesitate to start thinking acceleration.

112x speed.

Unblocking!

[Question 1]

[There are two main nuclear fusion reaction processes in the interior of the Sun: the carbon cycle and the proton-proton cycle. 】

Just read this.

Li Zheng didn't feel right......

Shouldn't it be a problem like a villain's cart, a small ball floating, and a spring force......

Why did you play nuclear fusion as soon as you came up......

[Among them, the carbon cycle was proposed by Betty in 1938, and the carbon cycle reaction process is shown in the figure.] 】

[P, +e, and en represent protons, positrons, and electron-type neutrinos, respectively]

Li Zheng gradually became flustered, and looked at the picture by the way.

It is a circular diagram of carbon-12, nitrogen-13, unknown Y, nitrogen-14, unknown X, nitrogen-15, and six substances, which are connected from end to end, explaining the carbon cycle process inside the sun.

In the meantime, each step is accompanied by the entry and exit of protons, electrons, and neutrinos.

It's obviously a physical process.

Li Zheng tasted the taste of chemical rings.

He shook his head in fright.

Not good, the chemical poisoning is too deep.

GTMD circumferential ring.

After waving Zhou Chenghuan's smiling face, he continued to review the question.

The more I interrogate, the more panicked I became.

The subject has finally become something like this-

[The masses of +e, p, and He cores are known to be 0.511 MeV/c2, 1.0078 u, and 4.0026 u (1u≈931.494 MeV/c2), respectively.

[(1) Write the nuclides represented by X and Y. 】

[(2) Write the equations of all nuclear reactions in a carbon cycle]

[(3) Calculate the energy released after completing a carbon cycle process]

Li Zheng, who finished the review, was inevitably a little sluggish.

Is this really a question for high school students to explore?

The span between the preliminaries and the semi-finals is too scary, right?

Steady, steady.

Although this type of question has never been seen before.

But since you are here, you should have a solution with your current knowledge of physics.

Look closely at the picture......

As terrifying as it is, the process is nothing more than the entry and exit of protons, electrons, and neutrinos.

Every substance is nothing more than made up of these things.

Thinking of these, the countless chemical knowledge that Li Zheng had worked also came out, especially the part of "Physical Chemistry".

Elemental inference can be performed by calculating the protons, electrons, and neutrinos of X and Y according to the steps.

Following the cycle shown in the diagram, Li Zheng first saw Y, which became nitrogen-14 after adding a proton.

Nitrogen-14 is made up of 7 protons and 7 neutrons, that is, Y has one less proton than nitrogen-14.

That is, the number of protons in Y is 6.

At this point, it instantly became junior high school chemistry.

The number of protons determines the type of element, and the number of protons 6 can only correspond to carbon.

In addition, in addition to 6 protons, Y has 7 neutrons.

Therefore, Y = carbon-13.

To do this, Li Zheng didn't even stare.

Scold!

It's just that it looks scary.

Steady to do it, do it with your hands?

Following this method, he also easily came up with X as oxygen-15.

The first question is easily solved, and after understanding the entire carbon cycle.

The equation of the nuclear reaction, which is required to be written in the second question, has gradually become a scoring question.

Then, the difficulty is only the third question, which is to calculate the energy release of the whole process.

Take a look at this question, which is filled with protons and neutrinos going in and out, allowing you to calculate the energy released.

Do you still need to think about this?

Einstein's blasting head couldn't be suppressed.

E=mc2 greeting on.

(Energy released = mass X-speed squared)

It is only necessary to calculate the total mass m of the lost substance.

Looking at the whole picture, a total of 4 protons, 1 helium-4, and 2 positrons were lost.

At this point, we will sweep to the terrifying numbers of "0.511 MeV/c2", "1.0078 u, and 4.0026 u".

Doesn't that give the quality out.

To make it easier to calculate, even the square of the speed of light helps you put it on the denominator.

As for MeV, it is a unit of energy, which represents a megaelectron volt (ev), which is purely a unit and does not matter.

So, just list the equation on the answer sheet, then open the calculator and come up with the final answer with a snap -

25.619 MeV。

Wow!

The nuclear reaction inside the sun is unraveled.

This is a life of cyclic fusion of carbon atoms!

Imagine that inside the sun, an ordinary carbon atom has repeated this process for 4.6 billion years.

Li Zheng couldn't help but feel excited.

At the same time, he silently closed his eyes.

And listen to the wind.

It's back.

The wonder of learning.

Physics is cool.

All of them are back.

That's my natal physics.

Don't be afraid of the most terrifying subject.

Face it bravely.

Even if it's Lin Yujing, I'll show you.