I Just Want to Be a Quiet Top Student

Solid-state physics is also related to chemistry, with a little bit of physical chemistry.

Materialization is so annoying, those who study physics are afraid of it, and those who study chemistry are also afraid of it.

In fact, Shen Qi is also a little apprehensive about materializing, this thing is both materialized and transformed, and it is not materialized and not transformed, killing people does not pay for life, it just wants you to die.

For this problem, the sum Ep of the interaction energy between ions in NaCl crystal has been given.

When r deviates from r0, Ep deviates from Ep0, and the amount of deviation is U.

Then use x to represent the relative offset. To get the power series relationship between U and x, a Taylor expansion must be done, that is, the Taylor expansion of Ep at r0 is used.

It's really tormenting. To do a physics problem, you have to know Taylor's expansion. Fortunately, Taylor's expansion is very simple... Shen Qi began to answer the questions on the test paper.

The power series expression of U(x) is:

U(x)=A0+A1x+A2x^2+A3x^3+...

...

From adiabatic compression we know:

1/κ=-V（dp/dV）∣r=r0

......d^2Ep/dV^2=d/dV(dEp/dr*dr/dV)=...

Finally: m=9.4; α=1.77; am=2.53×10^-109J*m^9.4

I don't know if it's right or not, it's the only way to do it, time is running out, and there are five more questions to come. Shen Qi hurriedly went to answer the following questions.

The fourth question, at first glance, seemed ordinary, but when Shen Qi thought about it carefully, it was quite scary.

"A certain amount of ether is enclosed in a glass tube, one part is in liquid state and the other part is in gaseous state."

"There are no other impurities in the tube. If the volume in the tube is exactly the critical volume of these ethers, then when it is slowly heated to the critical temperature, the liquid level will disappear because there is no difference between the gas and liquid phases..."

Although the first three questions took a lot of time, on the fourth question, Shen Qi carefully reviewed the questions again.

At this point in the review, Shen Qi felt an ominous premonition, and his spine felt cold.

It's liquid, it's gas, it's critical...

This shows what?

What does this portend?

Van der Waals gases!

There is no doubt that the problem involving Fan's gas must be a pure materialization problem.

What are you afraid of?

is it?

is it!

It shouldn't have come.

But it has come.

It came after all.

Silence, a moment of silence.

Shen Qi must do it in the shortest possible time.

Solve a problem.

in a glass tube.

The ratio of gas and liquid phases.

How much is it?

Ether, colorless and transparent.

But it is the life-threatening liquid in the rivers and lakes of materialization.

Deadly, liquid.

Killing is invisible.

Where there are van der Waals, there are rivers and lakes.

But the most dangerous thing is not the liquid.

Rather.

Gas-liquid coexistence.

Bg and B1.

Finally, Shen Qi wrote:

Take 1mol of ether, with the change of temperature, the total volume is Vk, and the mole fractions of gas phase and liquid phase are α(T) and β(T) respectively.

αVg+βV1=Vk

When the temperature is T, the saturated vapor pressure is p0, and by the equal area method, we get:

∫ Up Vg down V1pdv=p0 (Vg-V1)

Substitute the points to get:

RTlnVg-b/V1-b-a(1/V1-1/Vg)=p0(Vg-V1)

...

From Fann's equation:

...

ΨFan's ΦΨ Equation* Brain Supplement Swastika

...

Get:

Liquid phase B1=44.1%

Gas phase Bg=55.9%

In the end, Shen Qi gave his answer, that is, the ratio of liquid phase B1 and gas phase Bg.

After completing the first four questions, it took 2 hours.

There were four remaining questions, and Shen Qi only had one hour to answer them.

It's not that he doesn't work hard, this final exam paper is really difficult.

After completing questions 5, 6, and 7, Shen Qi only had 10 minutes left.

At this moment, the contestants in front of Shen Qi packed up their stationery and raised their hands.

Shen Qi is very familiar with this kind of behavior, he used to do it often and hand in the papers in advance.

The invigilator walked up to the student in front of Shen Qi, and asked softly, "Hand in the paper?"

"Yes." The contestant nodded. He is from Suzhou-Hangzhou No. 2 Middle School, a strong school in Wujing Province, Zhejiang Province.

This player from Suzhou-Hangzhou No. 2 Middle School was sitting in front of Shen Qi, and Shen Qi couldn't ignore it even if he wanted to.

Regardless of whether it is a math competition or a physical competition, teachers and students who engage in subject competitions have heard of the name of Suzhou-Hangzhou No. 2 Middle School.

The same is the No. 2 Middle School. Shen Qi's Nangang No. 2 Middle School is incomparable to his Suhang No. 2 Middle School. Their Suhang No. 2 Middle School operates in a group and has sub-rules everywhere. Nangang No. 2 Middle School only has a few acres of land for self-entertainment.

"Do you want to hand it in or not? I've been tired of this kind of game for a long time." Shen Qi watched the contestants of Suhang No. 2 Middle School hand in their papers and leave, and began to review the last question.

The last question is not easy. It takes a few minutes to read the question carefully.

"In a particle collision experiment, it was observed that a low velocity k-meson interacted with a resting proton p, generating a π+ meson and an unknown x particle."

"It is known that the magnetic induction intensity of the magnetic field B is B=1.70Wb/m^2, and the measured radius of curvature of the π+ meson track is R1=34.0cm."

"1. Try to determine the radius of curvature R2 of the x particle track."

"2. Please see the table below:

The table headers are: particle name, symbol, -rest mass/MeV+, charge (e)

The specific information for each line is:

Positron, electron; e+, e-; 0.511; ±1

Muons; μ+, μ-; 105.7; ±1

π meson; π+, π-; 139.6; ±1

neutron; n; 939.6; 0

Λ particle; Λ^0; 1115.4; 0

Negative Σ particle; Σ-; 1197.2; -1

Neutral 3 particles; Ξ^0; 1314.3; 0

..."

The particle list has a dozen lines in total.

The second question is: "What kind of particle is x?"

10 minutes, a total of 10 minutes for reviewing questions plus answering, Shen Qi only has 10 minutes left.

If you want to change to an ordinary person, you probably have to give up the answer to the last question.

But Shen Qi didn't give up. After carefully reviewing the questions, he had 7 minutes left.

This is a question about modern physics. The way to solve the problem should be... What else do you need? The situation is critical at the moment of fire, so just roll it on the paper!

Shen Qi picked up the pen without hesitation and began to masturbate.

Considering the Lorentz force, the velocity and mass of the two particles remain unchanged.

From Newton's second law in relativistic form:

F=d/dt(mv)

...

π+ mesons and x particles do circular motion under the action of Lorentz force, and the radius of rotation is:

R=mv/eB

...

Because m1v1=m2v2, and the absolute value of electric charge of the two particles is the same, the radius R2 of the circular track of the particle is the same as the radius R1 of the circular track of π+ meson.

Get R2=R1=34.0cm

It took Shen Qi 3 minutes to come up with the answer to the first question. The radius of curvature R2 of the track of the x particle is the same as the R1 of the π+ meson, both of which are 34.0cm.

My problem-solving speed is second to none, faster than the movement speed of particles... Shen Qi completed the first question with the speed of light.

There is no way, people are forced to come out, and maybe they can break out at level 15 in adversity.

God damn R2 is equal to R1, I don't even believe this answer...Shen Qi has to believe it if he doesn't believe it, there are more than 3 minutes left, he has to complete the second question immediately, there is no time to check the correctness of the first question.

The second question requires Shen Qi to determine what kind of particle x is.

Based on the radius of curvature R2=R1=34.0cm of particle x calculated in the first question, Shen Qi needs to do some calculations to determine what kind of particle x is.

If the answer to the first question is wrong, the second question must also be wrong.

There is no turning back, there is no time.

Even if the first question is wrong, you have to bite the bullet and continue to make mistakes!

This is Shen Xueba's last stubbornness.

Shen Qi once again sacrificed his light-like hand speed and powerful mathematical calculation ability, and he calculated directly on the paper:

v1=eBR1c/root m10^2c^2+e^2B^2R1^2=1.6×10^-19×1.7×0.34×……m/s

...

Although the time is tight, Shen Qi still deduces and calculates according to what he thinks are rigorous and correct steps. The formulas that should be written must be written completely, and the key steps that should be explained in words must be written in a few words, such as "substitute, get", This is the basic quality that a scholar should possess.

Substitute, get: m20c^2=1196MeV

1196MeV... Shen Qi compared the particle information list on the test paper, so x is a Σ-particle?

Jingle Bell!

At this time, the handing bell rang.

Shen Qi pressed the bell and wrote the final answer on the scroll: x is a Σ-particle.

It is really the speed of life and death, the speed of life and death of the Wujing version.

Even though the examination papers were handed in hastily and there was no time for inspection, not even a one-minute inspection, as a top student, he should walk out of the examination room calmly and gracefully, which is also the basic quality that a top student needs to possess.

Shen Qi walked out of the examination room calmly and gracefully, ah, there was light rain in the sky, what an unusual day.

"It's very difficult to get full marks in the theoretical questions of the National Finals. From the preliminary round to the semi-finals, and from the semi-finals to the finals, I took three physical competition theory exams. The worst case may be that I can't get a full score in one theory exam. "Shen Qi walked in the light rain, pattering.

"Shen Qi!" Suddenly a voice came from behind, and Mu Rong chased after him with an umbrella in his hand.

Mu Rong was holding an umbrella, the bottom of which just accommodated the two teachers and students: "How did you do in the exam?"

"Let me hold the umbrella." Shen Qi took the umbrella. He was more than ten centimeters taller than Mu Rong, and Mu Rong struggled to hold the umbrella.

"It seems that you are calm." Mu Rong observed Shen Qi's expression.

Shen Qi whispered: "Bamboo stick straw sandals are lighter than horses, who is afraid."

"A cloud of mist and rain, Ren Pingsheng." Mu Rong immediately answered the next sentence, and then asked cautiously: "Shen Xueba, can you get full marks in the exam after being resurrected with full blood?"