Chapter 192

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

Lin Qijing is in front, Li Zheng and Jiang Qinghua are behind.

The alliance principle is very simple, the physical problem is solved internally, don't be despised by Lin Chaojing, and don't give her a chance to pretend.

Tao Feifei is also prepared for this long time. Seeing the three people coming, he directly throws a key and a stack of nailed materials to Lin Yujing.

"These are some experimental problems. You should go to the laboratory to prepare them, and I'll go there after I give them an account."

Lin Qijing did not reach out to pick it up. He just turned his back and said, "I want to do the real topic today."

"Oh..." Tao Feifei also only spread out his hands, "all right, you are happy."

No way, she can only do this to Lin Yujing.

Not only she, but also among all the people she knew, there were only a few who could guide Lin qiojing.

As for her, she is also crossing the river by feeling the stone. More often than not, she is not teaching Lin Yujing, but exists as a "problem collector".

Tao Feifei then sat down, shook the mouse, turned on the computer, slightly jokingly asked: "preliminaries, semi finals, finals, iPho, Russia, what flavor do you want to set this time?"

"All All right... " Lin qiojing was somewhat embarrassed. He put stationery on the table beside him and glanced at Li Zheng and Jiang Qinghua: "where are they?"

"They have to talk about it alone." Tao Feifei twisted his chair and looked at Li Zheng and Jiang Qinghua in the corner. He swallowed and spat, "you two What are you doing so far away? "

"Cold." Jiang Qinghua did not dare to look directly at Tao Feifei.

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

Tao Feifei, after all, is a physics teacher. He would not choose this job if he had no intelligence.

It is obvious that Li Zheng and Jiang Qinghua know that there is a terrible gap between them, and they are very cautious about the physical approach.

Tao Feifei didn't say much. He just lifted his glasses and laughed.

"One by one."

"Qinghua's goal now is to advance to the preliminaries. I suggest that we still do the preliminaries."

"Why don't you follow suit, Li Zheng?"

"Yes." Li Zheng raised his hand and said, "but I have finished nearly 10 years. If I have to do it, I will do what I did before 2008..."

“？？？”

Tao Feifei, Lin yuejing and Jiang Qinghua are in a panic at the same time.

"Well! You're not ready? " Lin was the first to scold.

Agreed to let two months, cheating!

"It's not what you think." Li Zheng quickly raised his hand, and his expression was not conscious of sadness. "During that time, I did physics problems purely as a vent. In the last week of training, I did read some competition textbooks, otherwise I didn't have the courage to face the next day."

Tao Feifei and Jiang Qinghua can't understand this.

But Lin Yue Jing can taste the taste.

Imagine if you put her in a place and do chemistry for 24 days.

I'm afraid it's crazy.

Tao Feifei's face was full of disbelief. Obviously, he didn't believe that: "there are not only national papers for the preliminary contest, but also some provinces will come up with them. How can you have hundreds of sets of papers in the past ten years

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

“…… Well, it's you. " Tao Feifei gave a wry smile and then asked, "how many points can you get in 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 making those preliminary examination papers.

As for how many points this can get, I'm not sure.

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

"In this case You'd better do the second round. The questions before 2008 are too old. " Tao Feifei said, searching for exercises on the computer, "Qinghua, you are still..."

"Then I'll try the rematch, and challenge once in a while." As Jiang Qinghua spoke, he blinked with Li Zheng.

"Well..." Tao Feifei didn't object, she just pursed her lips and shook her head.

It's almost time to hit Jiang Qinghua.

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

If Jiang Qinghua's physical level is 50.

The level of Lin Yu Jing, no matter 500 or 500 000, is equally incomprehensible to Jiang Qinghua.

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

Now Li Zheng, who has been immersed in the competition for several months, is back. He is the reference for Jiang Qinghua to realize that he is just right.

Tao Feifei doesn't look down on Jiang Qinghua either. It's mainly for ordinary students. It's really unwise for them to put their energy into the competition. They have to leave early and get down to earth.Tao Feifei then searched for the right test paper and asked casually, "do you want to do the rematch together?"

"Well."

Lin Qijing lost his language function in an instant and entered the combat readiness state. He took out his beloved light blue signature pen and turned it on to check the height of the starting pen.

Li Zheng saw the situation and scolded him secretly.

What Lin Qijing has done now is equivalent to arming the battleship to fight with the fishing boat.

Is it necessary, mom?

I didn't do well in the preliminary contest.

It's really narrow-minded, ye Chengzhu.

Li Zheng's attitude towards Lin Qijing was just getting better because of his cooperative performance.

At this time, it was in combat readiness again.

There is no doubt about it.

Next, war.

Every time Lin qiojing does the same set of questions, it is war.

Li Zheng will not open his mind to speed up the official competition.

Because it's a competition for honor.

But in the face of the war with Lin Yujing, no matter how many times, he would do anything.

In the face of war, no one will be soft hearted.

Soon, three hot papers rolled out of the printer.

Tao Feifei explains as he repackages.

"Li Zhenggang came here. Let me talk about the competition process again. There are some differences between physical competition and chemical competition."

"First, there are a lot of participants, and the intensity of competition is much higher than that of chemical competition."

"The preliminaries will be held in April next year, and anyone can sign up. We in Jijing usually work out the preliminaries by ourselves, which is a little 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 have already understood."

"After the preliminaries, Jijing Physics Society will select 5% - 8% of the candidates to enter the second round according to the specific number of applicants."

"The theoretical part of the second round is the national unified examination. After the reform last year, the full score of the theoretical examination was 320 points."

"It should be noted that the difficulty of the second round is much higher than that of the first round. It can be said that the preliminary contest is only to select people who study physics seriously, and the second round is to select people with physical talent."

"Among them, those who rank in the top 70 or so of theoretical achievements can enter the experimental stage and compete for the qualification of provincial one and finals."

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

"After the national finals and national team training, mostly the same as the chemical competition."

"Among them, the top five in the intensive training assessment will represent China to participate in iPho."

"The sixth to thirteenth places will represent China in the APhO, the Asian Physics Olympiad."

"The members of the two national teams are not restricted to regions, they can be from one school or one class."

"Li Zheng, do you have any questions?"

Li Zheng's heart surged with emotion.

He deserves to be a physics teacher. He speaks much more clearly than Yu HONGSUN and LeYang.

At the same time, he was a little flustered.

Inexplicably feel, the farthest distance, is not country one and province three.

I go to iPho, you go to APhO

Of course, he has some problems.

Li Zheng immediately asked, "that is to say, Jijing provincial team members will be directly determined according to the results of the second round, and there is no need to train and select any more?"

Tao Feifei nodded and said, "yes, the experiment has already been investigated in the second round and will not be investigated any more. However, there will still be some high-level trainees in the training. Generally, they also take part in it. Occasionally, there are people who are too strong to take part in. If they don't participate, they can't help it."

"Well." Lin Qijing heard the speech and shook his legs and thumped, "or physics is good."

"It's more than quiet." Jiang Qinghua, sticking to the heater, sighed, "my goal is more realistic. It would be nice to get a provincial three."

Tao Feifei raised his glasses after hearing the speech, and his tone became serious.

"It's not easy to save three."

"This is physics."

"Take the set of questions we just printed out."

"First of all, the difficulty of the second round is already very high, and the ups and downs are very big. If we convert into the hundred point system, the city's first place may be less than 60 points when it is low, and 80 points or 90 points when it is high, which is very rare."

"As for the set you are about to do, it is the real title of the 32nd round in 2015."

"The difficulty of this set of questions is relatively low, which is probably the penultimate in recent years."

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

"For your convenience, I'll convert all of you into hundreds."

"At that time, the city ranked first, which was about 68.12% of the percentage system. If the experiment was not included, the first saving score was about 46.87."

"I don't know if it's the first in the country. Probably it won't exceed 75 points."

Almost without stumbling, Tao converted the 160 point system into a 100 point system.Although it is not a complicated calculation, this mental computing ability can be seen.

In a flash, she had divided the papers into three copies, supplemented by two answer papers and two grass-based papers.

"Any questions?" "Sophie asked at last.

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

"This No one cares... " "Tao Fei scratched his head." ten twenty? It's almost that. "

"I understand." Jiang Qinghua said, also took out his calculator, "I am 20 points to work on it."

Li Zheng looks at jiangqinghua, who seems to have a determination. Somehow, he sees the teacher Mengxi once in a trance.

If you talk about it, the score will probably be a number

Tao Feifei was not good at attacking jiangqinghua. He got up and started the test paper. On the first hand, he pushed Lin yuejing: "yuejing, my expectation for you is 65. This score can guarantee the provincial team, and there are four months to review."

"Well." Lin Passover Jing took over the paper and was absorbed in her language ability.

After that, Tao gave Li Zheng the second volume: "Li Zheng, this paper has entered the talent selection stage. Considering that you haven't started systematic competition study, my requirement for you is 35 points. As long as you are above this score, I am confident to take you to the provincial team."

"Go all out!" Li Zheng had heard the nostrils burning.

It's teacher Tao who is the mother. This is more overbearing than my old son.

35 points right?

I have been mixing for so long, but I should fight for this humiliating score?

Come on, but see how abusive the problem is.

Finally, Tao sent the third volume to jiangqinghua.

"20 points are too difficult. 14 points. We will save three points for 14."

"OK!" Jiang Qinghua is excited to pull out his pen.

"If it's less than 14 points..." "I hope you will put in the college entrance examination review soon, so don't think about the competition again."

"Ah..." Jiangqinghua sighed with a sigh.

It's only at this point that I realize it.

The original purpose of this examination.

It's to persuade yourself.

Jiangqinghua can not help but have a red eye.

I have been studying for two months. Is it so unbearable for me, Mr Tao?

I've been rotten with the Russian demon problem.

Damn it, No.

14 points.

There is always a way to get it for 14 points.

In this regard, the three men "to" crush Li Zheng, determine absolute status ", in order to" more victories with Lin Yue Jing "and" prove themselves ".

At the same time, the tension was launched.

For a while, there was only the sound of paper rubbing in the office.

Tao Fei didn't care about it, so he went to water and continued tea.

In the office, Li Zheng has no hesitation to start thinking acceleration.

112 times the speed.

Unseal!

There are two main fusion processes in the sun: carbon cycle and proton proton cycle. 】It was just read here.

Li Zheng doesn't feel right

Should it be a small cart, a ball floating water, spring force, etc

How to play nuclear fusion as soon as I came up

[among them, carbon cycle was proposed by Betty in 1938, and the carbon cycle reaction process is shown in the figure. 】In the figure, P, +e and en respectively represent protons, positron and electron neutrinos.

Lizheng is gradually flustered, by the way.

It is a circular cycle diagram composed of carbon-12, nitrogen-13, unknown substance y, N-14, unknown x, N-15 and six substances, which is connected at the beginning and end, explaining the carbon cycle process inside the sun.

During this process, each step is accompanied by the entry and exit of protons, electrons and neutrinos.

It is a physical process.

Li Zheng has produced a chemical ring.

He shook his head in fright.

No, the chemical poisoning is too deep.

Gtmd is in a circle.

After he waved off zhouchenghuan's smiling face, he continued to examine the problem.

The more trial, the more panic.

The subject has finally become this kind of thing -

br > the mass of +e, P and he nuclei are known to be 0.511mevc2, 1.0078u and 4.0026u (1U ≈ 931.494mevc2)] br > br > br > write out the nuclides represented by X and y. 】It is inevitable that Li Zheng, who has finished the examination, is a little sluggish when he finishes the examination.Is this really a question high school students should explore?

Is the span between the preliminaries and the rematch questions too terrifying?

Steady, steady.

Although this type of question has never been seen.

But since we are here, we should have a solution with our present physical knowledge.

Look at the picture carefully

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

Every substance is made up of these things.

Think of these, Li Zheng once gnawed countless chemical knowledge also came out, especially "Physical Chemistry" part.

As long as the proton, electron and neutrino of X and y are calculated according to the steps, the element inference can be carried out.

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

Nitrogen-14 consists of seven protons and seven neutrons, which means that y is one proton less than nitrogen-14.

In other words, the proton number of Y is 6.

Here, the moment became junior high school chemistry.

The number of protons determines the type of elements, and the number of protons corresponding to 6 can only be carbon.

In addition, in addition to six protons, y has seven neutrons.

Therefore, y = carbon-13.

Li Zheng didn't even stare.

Oh!

It just looks terrible.

Do it steady. You can get it.

Following this method, he also easily concluded that x is oxygen-15.

The first question has been solved and the whole carbon cycle has been understood.

Second, the nuclear reaction equation required to be written has gradually become a sub problem.

So, the difficulty is only the third question, calculating the energy release of the whole process.

If you look at this problem, it's full of protons and neutrinos going in and out, so you can calculate the energy released.

Why not?

Einstein's explosive head couldn't be held down.

E = MC2 hello.

(the released energy = the square of the Mass X-ray speed)

only the total mass m of the lost material needs to be calculated.

A total of four protons, one helium-4, and two positrons were lost.

At this time, scan to "0.511mevc2", "1.0078u and 4.0026u".

It doesn't give us all the quality.

For the convenience of calculation, even the square of the speed of light is put on the denominator for you.

As for MeV, it's a unit of energy, which represents megaelectron volts (EV). It's a pure unit, no matter what.

Therefore, you just need to list the formula on the answer sheet, open the calculator, and then you can get the final answer -

25.619mev.

WOW!

The nuclear reaction inside the sun has unraveled.

This is the life of a carbon cycle fusion!

Think of the sun's interior, an ordinary carbon atom, which has been repeating this process for 4.6 billion years.

Li Zheng couldn't help but feel excited.

At the same time, he closed his eyes in silence.

Listen to the wind.

Back.

Learning is wonderful.

The beauty of physics.

It's all back.

This is my natural physics.

Don't be afraid of the horrible topics.

Face it bravely.

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

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