I Just Want to Be a Quiet Top Student

　　 Solid-state physics has something to do with chemistry, with a bit of physical and chemical properties.

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

　　 Actually, Shen Qi is also a little bit materialized. This thing is materialized and not materialized, and it is not worthy of killing. It just wants you to die.

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

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

　　 Then use x to represent the relative offset. To obtain 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 be a physics question, 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 got: m=9.4; α=1.77; am=2.53×10^-109J*m^9.4

　　 I don't know if it's right, it can only be done like this, time is rushed, and there are five questions behind. Shen Qi quickly entered the answer to the next question.

　　 The fourth question, at first glance sparse and ordinary, Shen Qi thought carefully, **** it, it's quite scary.

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

　　 "There are no other impurities in the tube. If the volume in the tube is exactly the critical volume of these ethers, then when the temperature is slowly heated to the critical temperature, the liquid level disappears because there is no longer a 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, Shen Qi had an ominous premonition, and his spine swished cold.

　　 is liquid, gas, and critical...

This shows what?

　　 What does this indicate?

　　 Van der Waals gas!

　　 There is no doubt that when it comes to Fan's gas, it must be a purely materialized problem.

　　 What is afraid of.

　　 is it?

　　 is it!

　　 It shouldn't come.

　　 But it's already here.

　　 It came after all.

　　 Silence, silence for a moment.

　　 Shen Qi must be in the shortest time.

　　 solve a problem.

　　 in a glass tube.

　　The ratio of gas phase to liquid phase.

How much is 　　?

　　 Ether, colorless and transparent.

　　 is the life-threatening fluid in the materialized rivers and lakes.

　　 life-threatening, liquid.

　　 Killing is invisible.

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

　　 But the most dangerous thing is not liquid.

　　 but.

　　 Gas and liquid coexist.

　　Bg and B1.

　　 Finally, Shen Qi started writing:

　　 Take 1 mol of ether, with the temperature change, the total volume is Vk, and the mole fractions of the gas and liquid phases 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:

　　∫ Upper Vg lower V1pdv=p0 (Vg-V1)

　　 substituting the points to get:

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

　　……

　　From Fan's equation:

　　……

　　Ψ Fan ΦΨ equation

　　……

　　 ask for:

　　 Liquid phase B1=44.1%

　　Gas phase Bg=55.9%

　　 Finally, Shen Qi gave his answer, that is, the proportion of liquid phase B1 and gas phase Bg.

　　 Completed the first four questions and took 2 hours.

　　 There are the last four questions left, and Shen Qi only has one hour to answer them.

　　 It's not that he didn't work hard. This test paper for the competition of the country is really difficult.

　　 After completing the three questions of 5, 6, and 7, only 10 minutes are left for Shen Qi.

　　 At this moment, the contestant in front of Shen Qi packed the stationery and raised his hand.

　　 Shen Qi is very familiar with this kind of behavior. He used to do it often and handed in papers in advance.

　　The invigilator walked to the classmate in front of Shen Qi and asked softly: "Hand in the paper?"

　　 "Right." The contestant nodded. He is from the Second High School of Jiangsu-Hangzhou High School in Zhejiang Province, Zhejiang Province.

　　 This Suzhou-Hangzhou Second High School player sits in front of Shen Qi, and Shen Qi can't ignore it.

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

　　 is also the second middle school. Shen Qi’s Nangang No. 2 Middle School is incomparable to the other Suzhou-Hangzhou No. 2 Middle School. The Suzhou-Hangzhou No.

　　 "You love to make friends or not, I'm tired of this kind of gameplay a long time ago." Shen Qi watched the contestants from Suzhou-Hangzhou No. 2 Middle School hand in their papers and began to examine the last question.

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

　　 "In a particle collision experiment, a low-velocity k-meson was observed to interact with a stationary proton p, generating a π+ meson and an unknown x particle."

　　 "The magnetic induction intensity of the known 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 following table:

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

　　The specific information of each line is:

　　Positron, electron; e+, e-; 0.511; ±1

　　 muon; 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 particles; Σ-; 1197.2; -1

　　 neutral Ξ particle; Ξ^0; 1314.3; 0

　　……"

　　 There are more than a dozen rows in the particle list.

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

　　 10 minutes, 10 minutes for review and answer, Shen Qi only has 10 minutes left.

　　 This is going to be replaced by ordinary people, I guess I have to give up the answer to the last question.

　　 But Shen Qi did not give up. After carefully reviewing the questions, he still had 7 minutes left.

　　 This is a topic of modern physics. The idea of ​​solving the problem should be... What kind of ideas do you need? The situation is critical at the time of the line of fire, so just write it on the paper!

　　 Shen Qi picked up the pen without thinking.

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

　　 From Newton’s second law in the form of relativity:

　　F=d/dt(mv)

　　……

　　Π+Meson and x particles make circular motion under the action of Lorentz force, the radius of rotation is:

　　R=mv/eB

　　……

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

　　 get R2=R1=34.0cm

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

　　 My problem-solving speed is no one, faster than the movement speed of particles...Shen Qi completed the first question with the speed of light hand.

　　 There is no way, people are forced out, and a level 15 combat power may burst out in adversity.

　　Shen Te, R2 is equal to R1, I don't believe this answer myself...Shen Qi has to believe it. With more than 3 minutes left, he must complete the second question immediately, and there is no time to check the correctness of the first question.

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

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

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

　　 can't look back, there is no time.

　　 Even if the first question is wrong, you have to bite the bullet and go on wrong!

　　 This is the last stubbornness of Shen Xueba.

　　 Shen Qi once again sacrificed his hand speed and powerful mathematical calculation ability. He directly calculated on the paper:

　　V1=eBR1c/root number m10^2c^2+e^2B^2R1^2=1.6×10^-19×1.7×0.34×……m/s

　　……

Although time is tight, Shen Qi still derives and calculates according to the steps he thinks is rigorous and correct~www.readwn.com~ The formula must be written completely, and the key steps of the use of text must be written in a few words, for example, "Substitute, get", this is the basic quality that a schoolmaster should possess.

Substitute 　　, get: m20c^2=1196MeV

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

Jingle Bell!

　　 At this time, the volume bell rang.

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

　　 is really the speed of life and death, the speed of life and death of the game version.

　　 Although it is a hastily handed in papers, there is no time for examination, even for a one-minute examination, as a student master, you should walk out of the examination room calmly and gracefully. This is also the basic quality that a student master needs.

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

"This time, it is very difficult to get a full score for theoretical questions in the national finals. From the preliminary to the semi-finals, from the semi-finals to the finals, I took three physical competition theory exams. The worst case might be that I couldn't get a full score in a theoretical exam. "Shen Qi strolled in the light rain, pattering.

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

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

　　 "Let me hold an umbrella." Shen Qi took the umbrella. He was ten centimeters taller than Mu Rong. Mu Rong was struggling to hold the umbrella.

　　 "It looks like you are very calm." Mu Rong observed Shen Qi's expression.

　　 Shen Qi whispered: "Bamboo sticks and awning shoes are lighter than horses, who is afraid."

　　 "A misty rain Ren Pingsheng." Mu Rong immediately took the next sentence, and then asked cautiously: "Shen Xueba, can he get full score in the full-blooded resurrection again?"