Chapter 191: Come back, all come back

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At 4 o'clock, Lin Yuejing, Li Zheng and Jiang Qinghua took their respective books and entered the physics teaching and research group.
Lin Yuejing is in front, Li Zheng and Jiang Qinghua Brothers Union are behind.
The principle of the alliance is simple. The physical problems are solved internally. Don’t be despised by Lin Yujing or give her the opportunity to pretend.
Tao Feifei had also been prepared for a long time. When they saw the three people coming, they directly threw a key and a pile of nailed materials to Lin Yuejing.
"Here are a few experimental questions. You go to the laboratory to prepare for it. I will pass them after I have explained them."
Lin Yuejing didn't reach out to pick it up, but just said, "I want to do a real question today."
"Oh..." Tao Feifei only spread his hand. "It's okay, just be happy."
No way, she can only do this to Lin Yuejing.
Not only her, but also all the people she knew who could guide Lin Yuejing are also few.
As for herself, she also touched the stones to cross the river, more often than not teaching Lin Yuejing, but existed as a "practice collection tool person".
Tao Feifei then 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 come this time?"
"Everything...all..." Lin Yuejing was a little embarrassed. He placed stationery on the table next to him and glanced at Li Zheng and Jiang Qinghua: "What about them?"
"They both have to talk about it." Tao Feifei turned his chair and looked at Li Zheng and Jiang Qinghua, who were shrinking in the corner, and swallowed. "You two... What do you do to hide so far?"
"Cold." Jiang Qinghua did not dare to look directly at Tao Feifei.
"Well, here is close to the heating." Li Zheng nodded.
After all, Tao Feifei is a physics teacher, and no IQ will not choose this job.
Obviously, Li Zheng and Jiang Qinghua knew that the terror gap with Lin Yuejing was even cautious about the physical approach.
Tao Feifei didn't say much, just lifted his glasses and smiled slightly.
"Say that one by one."
"Qinghua's goal now is to qualify for the preliminaries. I suggest doing the preliminaries."
"Or would you do it with Li Zheng?"
"Yes." Li Zheng raised his hand. "But I've finished it in the past 10 years. If you want to do it, you should do it before 2008..."
"???
Tao Feifei, Lin Yuejing and Jiang Qinghua panicked at the same time.
"Well! You said you didn't prepare?" Lin Yuejing scolded the first.
It's okay to let two months, lie!
"It's not what you think." Li Zheng quickly raised his hand, his expression unconsciously sad. "At that time, I did physics questions purely as a vent. During the last week of training, I really did read some competition textbooks. Otherwise, he did not have the courage to face the next day."
In this regard, Tao Feifei and Jiang Qinghua are completely incomprehensible.
But Lin Yuejing could taste it.
Imagine if you kept her in one place and did a 24-day chemistry problem.
I'm afraid it's crazy.
Tao Feifei's face was full of surprises, and apparently still not quite convinced: "The preliminaries will not only have national papers, but sometimes provinces will also come out on their own. How can there be hundreds of papers in the past ten years, have you done it?"
"Basically everything you can find on the Internet has been done." Li Zheng answered truthfully.
"...Well, it's you." Tao Feifei smiled bitterly and then asked, "Then how many points can you get for the preliminaries?"
Hearing this question, Li Zheng first reviewed the score.
【Physics: 207】
This is the result of consuming Zhang Xiaoke's physical supply after finishing the preliminaries.
As for how many points this can get, I am not sure.
"I don't know... it should be above 130." Li Zheng gave a cautious prediction.
"In this case...you should do the rematch, the questions before 2008 are too old." Tao Feifei said, searching for the exercises on the computer, "Qinghua, are you still..."
"Then I will try the rematch, and occasionally challenge it." Jiang Qinghua blinked at the same time as Li Zheng, and the true brothers moved in and out.
"Alright..." Tao Feifei did not object, but just shook his head.
It's almost time to blow Jiang Qinghua.
After all, the levels of Jiang Qinghua and Lin Yuejing are not in one dimension at all.
If the physical level of Jiang Qinghua is 50.
Then Lin Yuejing's level, whether it is 500 or 500,000, is as incomprehensible to Jiang Qinghua.
There is simply no way for Jiang Qinghua to recognize his strength.
Li Zheng, who has been immersed in chemical competition for a few months, is back. He uses it as a reference to let Jiang Qinghua recognize that he is just right.
Tao Feifei does not look down on Jiang Qinghua, mainly for ordinary students, it is too unwise to put their energy into the competition. It is too unwise to leave the water early.
Tao Feifei then searched for the appropriate test paper and asked smoothly: "Does Jing also do a rematch together?"
"Well."
Lin Yuejing instantly lost his language function and entered a state of combat readiness. He took out his beloved light blue signature pen and unscrewed it to check the height of the pen.
Seeing this, Li Zheng only scolded under his heart.
What Lin Yuejing is doing now is equivalent to fully arming the battleship to fight the fishing gang.
Is it necessary to be so serious?
Isn't it just that I didn't do well in the preliminary competition?
Really narrow-minded, Lord Ye.
Li Zheng's attitude towards Lin Yuejing was only getting better because of the cooperative performance.
At this time, enter the state of combat readiness again.
no doubt.
Next is the war.
Doing the same set of questions each time with Lin Yuejing is a war.
Li Zheng will not open his mind to accelerate formal games.
Because that's for the competition of honor.
But in the face of the war with Lin Yuejing, no matter how many times, he will do whatever he wants.
In the face of war, no one will be soft-hearted.
Soon, three hot rolls rolled out of the printer.
Tao Feifei explained it while packing.
"Li Zheng just came, let me talk about the competition process again, physical competition and chemical competition are still a bit different."
"First, the number of participants is large, and the intensity of the competition is much higher than that of chemical competition."
"Starting in April next year is the preliminaries. Anyone can sign up. We Jixing usually make their own preliminaries, which is slightly more difficult than the college entrance examination, but it will not be too difficult. Li Zheng has done a lot of sets, I believe you have already I understand."
"After the preliminaries, the JJ Physics Society will select 5%-8% of people to enter the semi-finals based on the specific number of applicants."
"The theoretical part of the semi-finals is the national unified examination. After the restructuring last year, the full score of the theoretical examination was 320 points."
"It should be noted that the test questions for the semi-finals are much higher than those for the preliminary rounds. It can be said that the preliminary rounds are only for selecting people who study physics seriously, and the semi-final rounds are for selecting talents with physical talent."
"Among them, those who rank in the top 70 in theoretical results can enter the experimental stage and compete for the provincial and final qualifications."
"Generally speaking, the top 50 or so will get provincial one, and the top 20 or so can enter the provincial team."
"The subsequent national finals and national team training are probably the same as chemical competition."
"Among them, the top five in the results of the training assessment will participate in the IPHO on behalf of my country."
"Sixth to thirteenth will represent my country to participate in APHO, the Asian Physics Olympiad."
"The members of the two national teams are not restricted to regions, and all can be in one school and one class."
"Li Zheng, do you have any questions on your side?"
Li Zheng has already heard the surge of emotion.
Worthy of being a physics teacher, he is much clearer than Yu Hong and Sun Leyang.
At the same time, he had a little panic.
It is inexplicable to feel that the longest distance is not National One and Provincial Three.
But I go to IPhO, 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 directly determined according to the results of the semi-finals, and there is no need to train and select again?"
Tao Feifei nodded and said: "Yes, this part of the experiment has already been inspected in the quarter-finals, and no longer will be inspected, but there will still be training camps, and generally will participate. Occasionally there are people who are too strong. Method."
"Well." Lin Yujing heard the words again and shook his legs. "It's still good physical."
"It's worthy of being quiet." Jiang Qinghua sighed against the heater. "My goal is more realistic. It would be better if I could save three."
Tao Feifei raised her glasses and heard a serious tone.
"It's not easy to save three."
"This is physics."
"Take this set of questions we just printed out."
"First of all, the difficulty of the rematch question is already extremely high, and the ups and downs are very large. If it is converted into a 100-point system, the city may not be the first in the city when it is low. It may be less than 60 points. When it is high, it may occasionally have 80 points and 90 points. It is already very rare."
"As for the set you will do right away, it is the 32nd rematch in 2015."
"The difficulty of this set of questions is on the low side, probably ranking second to last in recent years."
"There was no restructuring at the time. The full score of this set of theoretical questions was 160."
"For convenience, I will convert all of you to a percentage system."
"At that time, the city's first was about 68.12 points on a 100-point scale. If you don't count on the experiment, it would be 46.87 points if you save one."
"I don't know the country's first, probably it won't exceed 75 points."
Tao Feifei converted the 160-point system into a 100-point system with almost no knocking.
Although it is not a complicated calculation, this mental arithmetic ability is also evident.
In an instant, she had divided the paper into three parts, supplemented by two answer sheets and two draft papers.
"Is there any problem?" Tao Feifei finally asked.
"Yes." Jiang Qinghua suddenly raised his hand. "How much is this... the third line of saving?"
"This... nobody cares..." Tao Feifei scratched her head. "Twenty minutes and twenty minutes? That's about it."
"Understood." Jiang Qinghua said, and took out his calculator. "I'm right for 20 cents."
Li Zheng looked at Jiang Qinghua, who seemed very determined, and somehow saw the former Mengxi teacher in a trance.
If you talk like this as soon as you come up, the score will most likely be in single digits...
Tao Feifei was also not good at attacking Jiang Qinghua, and he started his test paper as soon as he stood up, and pushed it to Lin Yujing as soon as he came up: "Yue Jing, my expectation for you is 65 points. This score can be guaranteed to enter the provincial team, not to mention There are four months to review."
"Well." Lin Yuejing took the test paper and concentrated on it, and his language ability left her further.
After that, Tao Feifei gave the second paper to Li Zheng: "Li Zheng, this paper has entered the talent selection stage. Considering that you have not started the systematic competition study, my request for you is 35 points, as long as you Now higher than this score, I have the confidence to take you to the provincial team."
"Go all out!" Li Zheng had already heard the nostrils blaze.
Mom deserves to be Teacher Tao, which is more aggressive than Lao Sun.
35 points right?
Lao Tzu has been fighting for so long, but he wants to fight for this disgraceful score?
Come on, let's see how bad this question is.
Finally, Tao Feifei sent the third paper to Jiang Qinghua.
"20 points is too difficult, 14 points, 14 points we will save three."
"Good!" Jiang Qinghua was excited to draw.
"If it is less than 14 points..." Tao Feifei secretly lifted his glasses, "I hope you will get involved in the college entrance examination sooner, and don't think about the competition anymore."
"Ah..." Jiang Qinghua sighed softly.
Only then realized.
It turned out that the real purpose of this exam.
Is dissuading himself.
Jiang Qinghua couldn't help but look at each other.
My two months of study, so bad teacher Tao?
I've broken all the Russian fairytales.
Damn, no way.
14 points.
With 14 points, there is always a way to get it.
In this regard, the three people were to "crush Li Zheng and determine his absolute status", to "win the war with Lin Yuejing" and to "prove himself".
At the same time, a tense answer was launched.
All of a sudden, there was only the sound of rubbing paper in the office.
Tao Feifei did not care about this, so he fetched water and continued tea.
In the office, Li Zheng did not hesitate to start thinking acceleration.
112 times faster.
Unblock!
【first question】
[There are two main nuclear fusion reactions in the sun: the carbon cycle and the proton-proton cycle. 】
Just read here.
Li Zheng felt wrong...
Shouldn't it be a villain cart, a ball floating, a spring, etc...
When I came up, I played nuclear fusion...
[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 in the figure represent protons, positrons, and electron-type neutrinos, respectively]
Li Zheng gradually panicked, looking at the picture.
It is a ring diagram composed of carbon-12, nitrogen-13, unknown Y, nitrogen-14, unknown X, nitrogen-15, six substances, connected end to end, explaining the carbon cycle process inside the sun .
In the meantime, each step is accompanied by the in and out of protons, electrons, and neutrinos.
Obviously it is a physical process.
Li Zheng tasted a chemical ring.
He shook his head in shock.
No, the chemical poisoning is too deep.
GTMD Zhou Chenghuan.
After waving away the smiley face of Zhou Chenghuan, he continued to examine the question.
The more trial the more panic.
The title has finally become this kind of thing-
[The masses of the +e, p and He cores are known to be 0.511MeV/c2, 1.0078u and 4.0026u (1u≈931.494MeV/c2)]
[(1) Write the nuclide represented by X and Y. 】
[(2) Write all the nuclear reaction equations in a carbon cycle]
[(3) Calculate the energy released after completing a carbon cycle process]
Li Zheng at the end of the examination is inevitably a bit dull.
Is this really a question that high school students should discuss?
The span between the preliminaries and rematch questions is too terrifying, right?
Hold on, hold on.
Although this type of question has never been seen.
But since it is here, it should be solvable with its current physical knowledge.
Look at the picture carefully...
Despite the terror, the process is nothing more than the in and out of protons, electrons, and neutrinos.
Every substance is nothing more than these things.
With this in mind, Li Zheng's countless knowledge of chemistry that once bitterly came up, especially in the "Physical Chemistry" section.
As long as the protons, electrons and neutrinos of X and Y are calculated according to the steps, element inference can be performed.
Following the cycle shown in the diagram, Li Zheng first saw Y, and after adding a proton, Y became nitrogen-14.
Nitrogen-14 is composed of 7 protons and 7 neutrons, that is, Y has one less proton than nitrogen-14.
In other words, the number of protons in Y is 6.
Here, 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 to 6 protons, Y also has 7 neutrons.
Therefore, Y = carbon-13.
Doing this, Li Zheng didn't even stare.
Ah!
It just looks scary.
Do it steadily.
Following this method, he also easily obtained X as oxygen-15.
The first question was solved easily, after gaining insight into the entire carbon cycle.
The nuclear reaction equation required in the second question has gradually become an issue.
Then, the only difficulty is the third question, calculating the energy release of the whole process.
This question is full of protons and neutrinos in and out, allowing you to calculate the energy released.
Do you still have to think about it?
Einstein's explosive head could not be suppressed.
E=mc2 greeting.
(Release energy = square of mass X speed of light)
It is only necessary to calculate the total mass m of the lost substance.
Looking at the whole picture, a total of 4 protons, one helium-4, and two positrons were lost.
At this time, scan the horrible numbers "0.511MeV/c2", "1.0078u and 4.0026u".
Doesn't it give 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 is an energy unit, representing megaelectron volts (ev), purely a unit, no matter what.
Therefore, just list the formulas on the answer sheet, and then open the calculator, and you can get the final answer by clicking it
25.619MeV.
Wow!
The nuclear reaction inside the sun unraveled.
This is the life of a cyclic fusion of carbon atoms!
Thinking about the inside of 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 closed his eyes silently.
And listen to the wind.
came back.
The beauty of learning.
Physically cool.
All are back.
This is my natal physics.
Don’t be afraid of even the most horrible subject.
Face it bravely.
Even Lin Yuejing will show it to you.