Chapter 570

It's really not difficult,

if it's hard for Xu mang to expand a simple problem into such a complicated one, it's hard to read it... Almost without fainting. Who's the problem?

I want to kill him.

The voice has just dropped,

Tong min and Lu Bo look at Xu Mang in surprise. He... He just said it is not difficult?

"Xiao Xu?"

"Are you... Are you sure it's not difficult?" Tong min was surprised and asked, "if you have a closer look... Maybe you are wrong, this topic is not as simple as you think, from frequency to volume expansion. This is a huge amount of calculation. Are you sure it is not difficult?"

"Is it?"

"I think it's ok..." Xu mang said with a smile: "do you have paper and pen?"

"Yes, yes, yes!"

Lu Bo quickly took out the consistent black pen and handed it to Xu mang. By the way, he handed over a piece of writing board with several manuscript papers on it.

After getting the paper and pen,

Xu started his own performance, but this time he planned to write slowly, pointing out the mistakes of these people while calculating.

"You see..."

"according to the photon, i.e., V to DV, the volume expands to V (T), so the calculation process is like this..." Xu mang wrote a very complex calculation process, but as he continued to simplify, the complex formula gradually became simpler.

"If t (T) = R (T) t (T) r (T), we can still get the distribution form of blackbody spectrum..." Xu wrote the formula lightly on white paper, but at this moment, the atmosphere of the scene was frozen.

Tong min, Lu Bo, Liu Yan and Zhao pengpeng simply can't imagine what happened in front of them. The problem that they have been baffled for more than half an hour has become so simple in the hands of this stranger.

Is this... Is this a fantasy world?

A dream world?

Otherwise, how can you do it!

From an extremely complicated calculation process, with continuous simplification, it gradually cleared away the fog and revealed its current appearance. At this moment, the four people present felt that they were about to suffocate, especially Liu Yan, a graduate student from the Department of mathematics.

Although

is all about the calculation process of physics, Liu Yan can't believe her eyes and make sure that this guy is reading physics? Not a math major?

It seems that this mathematical ability is almost the same as that of my own professor.

Even when the four were still in shock, Xu mang had completed his proof of the time relationship between heat balance distribution and temperature dependence, and the whole process was as smooth as flowing water without any hesitation.

"Finished..."

Xu mang asked with a smile, "is there anything you don't understand?"

"..."

"..."

"..."

"..."

the four were silent and were shocked by Xu Mang's powerful strength.

"Xiao Xu?"

"Who are you?" Tong min raised her head and looked at Xu mang seriously: "are you... Are you really a college student? You're not et, are you? "

"Have you ever seen such a handsome et?" Xu mang said angrily, "you are allowed to have an opinion on me, but please don't question my appearance. I'm not joking. I have a nickname in Fuda - Fangxin arsonist. Do you know what it means?"

"The man who set fire to a woman's heart..." Xu sighed, looked at Yang Xiaoman, and said helplessly, "I don't want to bear such a name... Unfortunately, it's fate, and it can't be changed."

“？？？”

“？？？”

“？？？”

Good narcissism,

good beating!

This guy... Isn't he a lunatic?

"Cough!"

"I said... Handsome little Xu?" Zhao pengpeng said with a wry smile, "Mr. Fang Xin arsonist, can you solve the third problem? If the above gas is replaced by a non interacting but mass particle gas and is in thermal equilibrium at the beginning, is it in thermal equilibrium under the influence of the expansion of the universe? "

The words fall,

four eyes shine on Xu Mang, and they are looking forward to Xu Mang's answer.

In the face of this question, I don't know what kind of explanation the mysterious Xiao Xu will make. Is it the same as the two previous questions, the answer will be given in an instant, or the myth will be terminated.

Xu mang didn't look at the topic. The third problem and the second problem are interrelated. Since the second problem has been solved, the third problem is as simple as digging through the bag.

"Say..."

"have you been cheated?" Xu asked curiously, "these problems... Should not be solved by graduate students like you. They involve many concepts. The second and third questions are based on the theory of heat death, the cosmological inference of the second law of thermodynamics, starting from this core.""You..."

"what's the name of the professor who provides this kind of topic?" Xu asked.

Hearing Xu Mang's words, Tong min and Lu Bo's expressions were full of calm. Tong Min said, "Professor Simpson, an expert in astrophysics, is an alternate member of the Princeton astrophysics Association."

Xu Mang:???

What?

Alternate member?

Reserve service?

For the first time, Xu mang heard about the existence of so-called reserve players in his research organization.

"Does this guy discriminate against China?" Xu mang asked curiously, "from your point of view, I feel the malice from the author. This is a deliberate embarrassment to you. With your limited level, it is impossible to solve such complicated cosmological problems."

Xu Mang's words, let the four feel a little unconvinced, Ivy League graduate students, even in his eyes become limited level?

Yes...

Xiao Xu is very powerful, but... Can't he be so arrogant?

This is the problem of relativistic cosmology, and Xiao Xu is engaged in the theory of relativity, although... There are some differences, but after all, it is a system, more or less understand a little.

"Yes

"He had a famous saying that he would rather recruit white black people than Asian students." Tong Min said: "Lu Bo and I are the exception, too good grades... Have to teach."

Xu mang nodded and said calmly, "I'll help you solve the third problem first."

As a matter of fact, Xu mang started to solve this problem. In fact, the malicious professor still had a little conscience. In terms of the concept of difficulty, Xu mang proposed a classification of levels, which were ordinary, nightmare, hell and death. These four levels of difficulty are not more than... There is a difficulty beyond the concept of cognition.

It's called Xu mang level...

in terms of the current three problems, it's only reaching the nightmare level.

"In fact..."

"for this problem, we should first calculate the number of particles with momentum between P and P + DP in the thermal equilibrium under the ideal gas approximation." While writing about the calculation process, Xu mang explained it lightly.

"Where e chemical potential can make it equal to zero, and since the expansion of particles is adiabatic, TV ^ R-1 = constant." Xu mang raised his head, glanced at the four people and said, "so some heat balance will be destroyed."

This...

that's the end?

Not even 30 seconds!

"Xiao... Xiao Xu?"

"Solved?" Tong min asked in surprise.

"Yes

"It's not a big problem in itself." Xu mang said with a smile: "there are some conceptual knowledge in it, you don't quite understand... Normal, but for me, it's something that I can get. I'll finish it with a white eye scan."

Four people did not speak, silently staring at Xu Mang, this guy... More and more mysterious, he looks particularly young, although wearing glasses, but the overall outline... Familiar.

"The last problem, solved... I went to the kebab." Xu shrugged his shoulders and said lazily, "let me see..."

for a moment,

Xu started to solve this last problem, which is still a hypothetical space. However, this condition is more extreme. The photon gas has no interaction with each other, and the mass is all zero, and the particle gas is composed of mass M. at a certain time, photons and neutrinos are heated at the same time Equilibrium state.

Then... The typical velocity and kinetic energy are given by the neutrino mass M.

It's not hard!

But it's cheap!

When Xu mang saw the final request, he almost didn't die of anger, and the difficulty suddenly rose from nightmare level to death level.

The professor asked for a fairly precise number.

Crazy?

Xu Mang's original decadent state disappeared. At this time, his face was full of seriousness.

Sleeping trough!

Merciless!

This... It seems that it can't be solved for a while.

Just as Xu mang is thinking about how to start, Tong min and Lu Bo almost mention their hearts to their voices. They see that Xu Mang's expression has changed. Instead of being as calm as before, they have a little bit of seriousness.

It's over!

It doesn't feel good!

Sure enough, the problem is different.

Two people looked at each other, from each other's eyes saw a trace of worry, the first three problems solved perfectly, the result... Fell on the last problem.

Alas...

it seems that the miracle is over.

"Xiao Xu?"

"No, even if... It's good to be able to solve three problems, and I don't think the professor will embarrass us." "Tong Min said seriously:" the last question he told us, no matter we look for anyone, as long as we solve... Let us graduate, we can imagine how difficult it is. "Xu mang Leng for a moment, curiously asked: "so rampant?"

“？？？”

“？？？”

“？？？”

Hearing Xu Mang's words, the four people look confused.

What do you mean?

It seems that you are more rampant than he is!

"Xiao Xu!"

"It doesn't mean to be rampant or not. How can I explain it to you?" Tong min helplessly said: "is no solution meaning... He did not give us any chance, this last question is decoration, just have a look."

Xu mang knows what he means by deliberately doing bad things.

However...

this problem is not without solutions, but it is more complicated to demonstrate and has great challenges in calculation.

Indeed,

it is a little more difficult for these two astrophysics graduate students to solve this problem. It is a pity that they met the beauty of this flourishing age, so I can only say sorry to the malicious professor. I'm afraid these two students will graduate early.

"Ah?"

"Will you inherit your family business after graduation, or do you plan to do academic research in Astrophysics?" Xu asked curiously.

"If I inherited my family business... I would go to business school." Tong Min said seriously: "if I graduate next year... I intend to engage in astrophysics research."

"The same."

"To engage in academic research in astrophysics." Said Lubo.

Xu mang took a look at the two men and fell into silence.

For a long time,

Xu mang said with an apologetic face: "I'm sorry... I'm afraid I'll let you down."

......

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