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[1] THE SCHOLAR ADVANCED TECHNOLOGY SYSTEM (END)
Chapter 59: You Want a Permission Slip? Let Me Test You
...welcome to read...
Translator: Translated Henyee Editor: Translated Henyee
There were two physics lessons during a three-day mathematical modeling competition.
Lu Zhou felt it was not a good impression to miss first grade and hence, he decided to personally hand over the clearance slip because he did not want to disturb the class leader.
From the class information provided by the Office of Academic Affairs, the physics teacher was called Li Rongen and he was an old professor with high qualifications. When Lu Zhou found his phone number, he called her to confirm that she was in his office before he left.
Lu Zhou knocked on the door before entering. He handed the clearance slip on the table and explained the reason.
"It's impossible not to get into class?" Said Professor Li. He took off his glasses and looked at the slip as he said, "Your name is Lu Zhou, right?"
"Yes," Lu Zhou said as he nodded.
Professor Li smiled and said, “Alright, let me ask you two questions. If you can answer any of them, I'll approve your permission slip. "
Whatisthis?
Lu Zhou was stunned.
"What's? Afraid? ”Ask Li Rongen with a smile.
"No," said Lu Zhou. He corrected his composure, shook his head, and said, "Professor, please ask me."
"First question, take this," Li Rongen said as he handed the A4-sized paper to Lu Zhou. Smiling, he said, “Write as many as you want. I want to see work. "
You even prepared a question?
Lu Zhou felt like the man who planned this. Otherwise, why would the question be printed on A4 paper?
Lu Zhou said nothing as he picked up the A4 paper and started reading the questions.
[Low-life of uranium 238 in a nuclear submarine is 4.5 × 10^9 years. There is a 0.7% chance of uranium decay of 234, which will release high-energy photons, 93% of which are absorbed by underwater steel plates. In 1981, a nuclear submarine from the Soviet Union transmitted a high-energy photo, measured with a 1.5 m detector from a nuclear source (treat the source as a point). The positive event area of the instrument is 22cm^2, the efficiency is 0.25% (one pulse signal per 400 event photos), 125 signals are measured per hour.
Find average lifespan of uranium core 238. (ln2 \= 0.693)
Find the mass of uranium 238 in the submarine (kg as a unit, 2 figs)
]
Lu Zhou finished reading the question and sighed in his heart.
No wonder he is referred to as one of the "four demons of physics" professors. What question!
By the way, the first physics lecture is next Monday. Why did he ask me this nuclear physics question?
"Do you want to sit down?"
"It's okay, I'll stand up."
Lu Zhou picked up a pen and draft paper from Professor Li. He was standing next to the office desk. Frowning, he began to think.
Physics is not his strong suit.
However, after an entire summer of grinding, he was invulnerable!
Five minutes passed and Lu Zhou relaxed before starting to write.
[Law of decay: N \= N0e ^ (- )
The relationship between the decay constant and the half-life constant is: N0 / 2 \= N0e ^ (- 1 / 2), from which T1 / 2 \= ln2 / ( 1 2)
]
Lu Zhou wrote down two equations and his eyes lit up.
He has managed to turn physics problems into advanced algebra problems.
Next, he just had to finish it!
First part!
Fast moving pen on A4 paper.
[(1) Average life span of radionuclide t \= ∫ 2Ntdt /N0 \= ... \= 1.1443T1/2
Replacing data gives T \= 6.49 * 10^9 years.
]
Professor Li looked at the A4 paper with raised eyebrows and he had an interesting look in his eyes.
Lu Zhou did not notice Professor Li's change in expression. He concentrated too much on the question when he started answering the next part.
[From the information provided, the number of high-energy photons produced by decay to U234 at dt time is dN · n0 \= n0 Ndt]
Let the efficiency of photons passing through the steel plate as n1, and the number of photons passing through the steel plate in time dt be calculated as dN1 \= n0 Ndt · 1
Number of signals generated ...
Able to calculate the amount of uranium 238 in the submarine, which gives mass.
]
Lu Zhou replaced all the data and calculated the amount of uranium 238 as N \= 7.456 × 10^25.
However, he was preparing to replace N to count the masses and finish the final blow to the enemy, Professor Li suddenly spoke.
"OK, I'll count that you pass."
Lu Zhou:? ? ?
He's not happy at all.
What do you mean you're gonna count that I pass?
I have done so until now. Can't you just let me finish it before speaking!
"Professor, I haven't finished ..."
"A high school student can complete this step" Li Rongen said. Smiling, he said, "You can finish it if you want."
The momentum of solving the question shattered and Lu Zhou fell silent.
His OCD forced him to solve the question.
Answer M \= 29634kg, two sig ig as 30kg.
The steps are correct and the answer is correct.
Lu Zhou wrote a full stop as he finished the question.
"Do you want to hear the second question?" Li Rongen asked with a smile.
Although Lu Zhou wanted to say "No", he remembered that the professor had not signed the clearance slip, so he replied, "Say me."
Li Rongen laughed and said, “Don't be nervous, the second question is very easy. Just say the second law of thermodynamics. "
When Lu Zhou heard this question, he let out a sigh of relief.
He thought that the professor would give him impossible questions to defeat him and destroy his ego. He was not expected to be released by Professor Li.
Usually, there are two different expressions of the second law of thermodynamics. One is the famous Kelvin equation, the other is a phrase mentioned by Rudolf Clausius in his 1850 thesis.
As for Hatsopoulos-Keenan's expression, it was a relatively new expression that had just appeared.
Lu Zhou read the textbooks carefully so that he did not miss it.
“For systems with energy, material composition, and certain parameters, there are stable balance conditions. Other countries can always be achieved through a reversible process, ” Lu Zhou said as he uttered this phrase easily.
"Not bad," Li Rongen said as he nodded in agreement.
Textbooks used by physics majors do not mention more advanced expressions in the text although they may have mentioned them in appendices. Students who are not interested in physics will never know this phrase.
Lu Zhou even read out this obscure fact, which proved that he had truly grasped the [University Physics] textbook.
After this investigation, Li Rongen was able to confirm that there was nothing that undergraduate physics courses could teach Lu Zhou.
I guess Old Tang isn't bragging, this kid is talented!
He'll sign the clearance slip regardless because he's just kidding.
Since yesterday, he has signed dozens of permission slips for mathematical models. One more won't be a problem.
Even if Lu Zhou did not reply, he would roast Lu Zhou a little but he would still sign it.
Li Rongen signed his signature before taking out a list of names from the drawer. He drew two lice before speaking in an old tone.
"Lu Zhou."
"What?"
“Do you have any plans for master?
Lu Zhou thought and said in an uncertain tone, "Sure."
Who knows what could happen in the future?
However, Professor Li's intuition was weaker than Professor Tang's. He did not hear any uncertainty in Lu Zhou's tone of voice. Instead, he simply nodded in agreement and continued.
“Our Jin Ling University physics department is one of the best in the country. Humblely, we bonded first. But for superconducting physics, electronic systems, condensed physics, and material design, they are not as good as us. We are the best. IF you are interested in physics, come to our Carbon Nanotube lab when you graduate. We are always looking for talented mathematicians. ”
This is…
Does he imply that I should apply to be a graduate student?
Lu Zhou laughed. He was only second year and was still far from doing masters.
After all, the teacher is good.
Lu Zhou sincerely said, "Thank you, professor."
Li Rongen smiled and nodded, “OK, grab the clearance slip and leave. You should take on more competitions like this if you can. If you want to do a Master, you have to be careful with the guaranteed Master's place. Or you can wait until you are in your third year and ask me or Professor Tang, whatever you want. "
Lu Zhou smiled and expressed his gratitude. Without saying anything more, he took out his hard-earned clearance slip and left.
Seriate