Academician Lin looked at Cheng Hao in front of him with a smile on his face and said.
"Hello, Academician Lin, I am Cheng Hao!"
Cheng Hao quickly said to Academician Lin in front of him.
Academician Lin stretched out a hand towards Cheng Hao, and Cheng Hao quickly held hands with Academician Lin.
After shaking hands.
"It's too crowded here, go to my office!"
With that said, Academician Lin turned around and walked towards the office on the side. Cheng Hao and Dean Liu quickly followed Academician Lin's back.
Soon, the three of them came to an office. There was no one in the huge office.
"Come and sit wherever you like."
After Academician Lin sat down in a seat next to him, he said to Cheng Hao and Dean Liu beside him.
After everyone took their seats.
At this time, with a smile on his face, Academician Lin looked at Cheng Hao and said, "Cheng Hao likes physics? Do you want to study for a degree in physics?"
Cheng Hao nodded quickly towards Academician Lin in front of him.
"As far as I know, your talent in mathematics is higher. I also read your article on the proof of Zhou's conjecture! It's really good!"
Academician Lin had a hint of emotion in his eyes, looking at Cheng Hao in front of him, his eyes full of appreciation.
"It is a blessing for us in China to have a mathematical genius like you! Your talent in number theory is extremely high. If you can devote your mind to it wholeheartedly, you might actually have a chance to solve the crown of number theory, the Riemann Hypothesis.
!Why would you want to be distracted by physics?
Physics is not that simple. Once you are distracted by physics, you may not be able to devote yourself to mathematics! In the end, the height you can reach in mathematics may be extremely limited!
"
Academician Lin looked at Cheng Hao in front of him seriously and said.
"As far as I know, I only know one person who can reach extremely high levels in both the fields of mathematics and physics, Edward Witten!
So, have you thought it through?"
Academician Lin looked at Cheng Hao in front of him and asked.
After Cheng Hao thought about it seriously, he said to Academician Lin in front of him: "I have always felt that no matter what I study, it is ultimately for the advancement of science and for all mankind to climb to the top! Although mathematics is indeed the cornerstone of science, it can
Solving mathematical problems is of extremely important significance to the future development of science.
However, what I want to do is not just to develop mathematics, what I want even more is to use my mathematics to guide the progress of science!”
Looking at Cheng Hao's serious eyes, Academician Lin looked at Cheng Hao in front of him with some surprise.
“Not a bad ambition!”
Academician Lin looked at Cheng Hao in front of him with some admiration.
"So since you want to study for a degree in physics, have you also studied physics on your own? How did it go?"
Academician Lin smiled slightly, looked at Cheng Hao in front of him and asked.
"Uh... okay..."
Cheng Hao hesitated for a moment, looked at Academician Lin in front of him and said.
"Haha! Then let me test you."
Academician Lin said with a smile in his eyes towards Cheng Hao in front of him.
"Can!"
Cheng Hao nodded and agreed.
At this time, Academician Lin took a piece of paper and a pen from the side and began to write on the table. Soon, a question was written by Academician Lin.
He handed the question to Cheng Hao who was standing aside.
"Come and take a look!"
Academician Lin said to Cheng Hao in front of him with a smile on his face.
Cheng Hao quickly took the pen and paper from Academician Lin's hand.
[A hydrogen atom in the ground state collides with another hydrogen atom in the stationary ground state. What is the minimum speed at which inelastic collision may occur? If the speed is large, light emission will occur, and light can be observed in the direction of the original speed. Ask this
-27What is the difference between the frequency of light and the normal frequency?】
[The mass of hydrogen atom is l.67x10kg, ionization energy e=13.6ev, -182.18x10j.]
Seeing the question in front of him, Cheng Hao was slightly stunned.
As expected of an academician, his approach is different. This is not a test question for ordinary physics beginners. This is obviously a competition question, and it is the kind of jumping around on the line.
However, Cheng Hao was not intimidated by this question.
Look at the question in front of you.
After thinking for a while, Cheng Hao had an idea.
[Analysis: The energy of the hydrogen atom in the ground state is e＇=-e·(1/1^2). The energy of the first excited state is e＇＇=-e·(1/2^2). The minimum absorbed by the hydrogen atom
The energy is △e＝e＇＇-e＇＝e[1/(1^2)-1/(2^2)]＝3/4e＝1.163*10^-18(j)】
[We must find the minimum speed at which the energy loss in the collision is the above data. If the collision is completely inelastic, the energy loss in the collision will be maximum, the speed after the collision will be v/2, and the initial kinetic energy and final kinetic energy are:
mv^2)/2-[2m(v/2)^2]/2=(mv^2)/4, this value should be equal to the smallest energy quantum △e=(mv^2)/4,
Therefore v=√(4△e/m)=6.26*10^4(m/s)
After inelastic collision, the speed of the two atoms is v/2=3.13x104m/s
The answer to the second question is related to the Doppler effect. For velocities much smaller than the speed of light, the ratio of relative velocities gives an excellent approximation of the relative change in frequency: 6.26*10^4:3*10^8=2.09*10
^-4＝2.09*10^-2%
The frequencies of the two beams of light are slightly smaller or slightly larger than the normal frequency according to this ratio.]
Cheng Hao's topic was written in great detail. Academician Lin on the side could not help but nod his head. The look in his eyes that looked at Cheng Hao became more and more appreciative.
"Academician Lin, I figured it out!"
Cheng Hao handed the paper to Academician Lin who was standing aside.
Academician Lin took the paper without reading it. He looked at Cheng Hao in front of him and smiled slightly: "The solution is good. It can be seen that the basic skills are still good! He has a strong learning ability!"
Cheng Hao smiled innocently, scratched his head and said nothing more.
At this time, Academician Lin in front of him suddenly spoke to Cheng Hao in front of him: "Recite the Kennan formulation of the second law of thermodynamics."
Cheng Hao was stunned for a moment, but he quickly remembered this knowledge point.
"For a system with given energy, material composition, and parameters, there is such a stable equilibrium state: other states can always be reached through reversible processes."
Cheng Hao opened his mouth and came immediately.
After hearing Cheng Hao's words, the look of satisfaction in Academician Lin's eyes became even stronger.
"Okay! The basic skills are very solid, not bad!"
Academician Lin nodded with satisfaction.
"Okay! I have no problem here!"
Academician Lin smiled and asked Cheng Hao in front of him: "Cheng Hao, do you have anything you need to know about me?"