Learning Demon Cultivation System

Only then did I realize it.

It turned out that the real purpose of this exam.

It is to dissuade oneself.

Jiang Qinghua couldn't help turning red in his eyes.

Is my two months of study so unbearable, Mr. Tao?

I have read all the Russian demon topics.

Shit, no.

14 points.

Just 14 points, there is always a way to get it.

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

At the same time, tense answers were launched.

For a moment, the only sound left in the office was the sound of rubbing paper.

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

In the office, Li Zheng turned on the acceleration of thinking without hesitation.

112x speed.

Unblock!

【first question】

[There are two main nuclear fusion reaction processes inside 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 pushing a cart, a small ball floating in water, or springs being forced hard...

Why did I start playing 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 neutrinos respectively]

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

It is a circular cycle diagram composed of carbon-12, nitrogen-13, unknown Y, nitrogen-14, unknown X, nitrogen-15, connected end to end, explaining the carbon cycle process inside the sun .

In between, each step is accompanied by protons, electrons and neutrinos in and out.

Obviously a physical process.

Li Zheng tasted the smell of chemical rings.

He shook his head in horror.

No, the chemical poisoning is too deep.

GTMD Zhou Chenghuan.

After waving Zhou Chenghuan's smiling face away, he continued to examine the questions.

The more the trial, the more panicked.

The title has finally become something like this——

[It is known that the masses of -e, p and He nuclei are 0.511 MeV/c2, 1.0078 u and 4.0026 u respectively (1u≈931.494 MeV/c2)]

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

[(2) Write down all the nuclear reaction equations in a carbon cycle]

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

After reviewing the questions, Li Zheng was inevitably a little sluggish.

Is this really a question that high school students should be discussing?

The span between the preliminaries and the rematch is too scary, right?

Hold on, hold on.

Although this type of question has never been seen before.

But since we are here, with my current knowledge of physics, there should be a solution.

Look carefully at the picture...

While terrifying, the process is nothing more than the in and out of protons, electrons and neutrinos.

Every substance is nothing but composed of these things.

Thinking of this, countless chemical knowledge that Li Zheng had studied so hard emerged, especially the "Physical Chemistry" part.

As long as the protons, electrons and neutrinos of X and Y are calculated according to the steps, element deduction can be carried out.

Circulating along the diagram, Li Zheng first saw Y, which turned into nitrogen-14 after adding a proton.

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

That is to say, the proton number of 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 corresponding to 6 can only be carbon.

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

Therefore, Y = carbon-13.

After doing this, Li Zheng didn't even stare.

Ah!

It just looks more scary.

Hold on and do it, is it easy to catch?

Following this method, he also easily obtained that X is oxygen-15.

The first question was easily solved, after gaining insight into the entire carbon cycle.

The nuclear reaction equation required to be written in the second question has gradually become a sub-question.

Then, the difficulty is only the third question, the energy released in the whole calculation process.

Check out this puzzle, full of protons and neutrinos coming in and out, and letting you calculate the energy released.

Is this still worth thinking about?

Einstein's exploding head couldn't hold back.

E=mc2 greets you.

(energy released = mass x speed of light squared)

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

Looking at the full picture, a total of 4 protons, one helium-4, and two positrons are lost.

At this time, scan to the scary numbers of "0.511 MeV/c2", "1.0078 u and 4.0026 u".

Doesn't this 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 a unit of energy, representing megaelectron volts (ev), which is purely a unit, don't worry about it.

Therefore, you only need to list the calculation formula on the answer sheet, then turn on the calculator, and you can get the final answer with a click——

25.619 MeV.

Wow!

Nuclear reactions inside the Sun unraveled.

This is the life of a carbon atom cycle fusion!

Thinking of the interior of the sun, an ordinary carbon atom has repeated this process for 46 billion years.

Li Zheng couldn't help feeling emotional.

At the same time, he closed his eyes silently.

And listen to the wind.

came back.

The magic of learning.

Cool physics.

All come back.

This is my natal physics.

Don't be afraid of any scary questions.

Face it bravely.

Even Lin Yujing will slaughter it for you.

Chapter 193 Opportunity Comes

When Li Zheng was obsessed with solving problems.

He didn't know that Jiang Qinghua had been scratching his head frantically for a long time.

sun?Fusion?Nuclear reaction equation?

Jiang Qinghua is in a mess.

The more chaotic it is, the more confused you will be by the terrifying title.

The more chaotic, the harder it is to find a simple and pure problem-solving idea.

After being confused for an unknown amount of time, Jiang Qinghua turned to the second question.

This is a classic problem of calculating kinetic energy and speed with a small ball hitting the rod.

This is good, there is a routine.

It is right to apply the formulas of conservation of kinetic energy and momentum.

However, he was wrong.

He didn't know, in the physics competition.

The more terrifying the question, the simpler it is.

The more mentally retarded things like small balls and poles, the more difficult it is.

For example, artificial satellite orbit, solar nuclear reaction, etc. Although the topic is very grand, it only tests your application substitution ability. As long as you combine the physical environment with simple knowledge, you can always give the answer easily. .

On the contrary, the balls and rods, these ghost things, will assess you to a terrifying degree——

Where did the ball hit the pole?

How does the rod twist?

After twisting to the limit, how will it shake back?

What state will it end up in?

By the way, there is a small ball tied to each end of the pole.

This complicated situation, using calculus to analyze step by step, is basically a foregone conclusion.

In this process, Jiang Qinghua undoubtedly got deeper and deeper.

He began to doubt himself deeply.