I really don't want to lie down and win

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As far as the current three questions are concerned, they have only reached the level of nightmares.

"actually..."

"For this problem, we must first calculate the number of particles whose momentum is between p and pdp in thermal equilibrium under the ideal gas approximation." Xu Mang explained the calculation process lightly while writing.

"The E chemical potential can be made equal to zero. Since the expansion of particles is adiabatic, TVr1 is constant." Xu Mang raised his head, glanced at the four of them, and said, "So the existing thermal balance will be destroyed."

This...

Is this the end?

Not even... not even 30 seconds!

"Xiao...Xiao Xu?"

"Solved?" Tong Min asked in surprise.

"Yup!"

"It's not a big problem in itself." Xu Mang said with a smile: "There are some conceptual knowledge in it, which you don't quite understand...it's normal, but for me, it's a matter of hand, and it's done with the white of your eyes. "

The four of them didn't speak, and stared at Xu Mang silently. This guy... was getting more and more mysterious. He looked very young. Although he was wearing glasses, the overall outline... seemed familiar.

"The last problem, after solving it... I'm going to grill the skewers." Xu Mang shrugged and said lazily, "Let me take a look first..."

moment,

Xu Mang began to solve this last problem. It was still in a hypothetical universe, but this condition was even more extreme. The photon gas had no interaction with each other, and its mass was all zero, while the particle gas was composed of mass m. At a certain moment, photons It is in thermal equilibrium with neutrinos.

Then...give the typical velocity and kinetic energy with the neutrino mass m.

Not difficult!

But cheap!

When Xu Mang saw the last request, he almost died of anger, and the difficulty suddenly increased from the nightmare level to the death level.

The professor asked for a fairly precise value.

Crazy?

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

What the hell!

ruthless!

This... It seems that this really won't be resolved for a while.

Just when Xu Mang was thinking about how to do it, Tong Min and Lu Bo's hearts were almost in their throats. They saw that Xu Mang's expression had changed. He was no longer as calm as before, but became a little more serious. Son.

Finished!

Feel bad!

Sure enough, the problem of the finale is different.

The two glanced at each other, and they both saw a trace of worry in each other's eyes. The first three problems were solved perfectly, but in the end... they fell on the last problem.

Ugh...

It seems that

The miracle is over.

"Xiao Xu?"

"Forget it... It's good to be able to solve three problems. I don't think... the professor will make things difficult for us." Tong Min said seriously: "He told us about the last question, No matter who we find, as long as we solve it... let us graduate, you can imagine how difficult it is."

Xu Mang froze for a moment, then asked curiously, "So rampant?"

"???"

"???"

"???"

Hearing Xu Mang's words, the four of them were stunned.

What do you mean?

It seems that you are... more rampant than him!

"Xiao Xu!"

"It doesn't mean rampant or not, this...how can I explain it to you." Tong Min said helplessly: "It means no solution...he didn't give us any chance at all, this last question is just a display, Just take a look."

Xu Mang understood what he meant, that he was doing something bad on purpose.

but...

This problem is not unsolvable, but it is more complicated to demonstrate, and there are great challenges in calculation.

indeed,

It is a bit more difficult for these two graduate students majoring in astrophysics to solve it. Unfortunately, I have met Ben Shengshimeiyan, so I can only say sorry to the malicious professor. I am afraid that these two students will graduate early.

"Ugh?"

"Are you inheriting the family business after graduation, or are you planning to do academic research in astrophysics?" Xu Mang asked curiously.

"If it is to inherit the family business...I will go to business school." Tong Min said seriously: "If I graduate next year...I plan to engage in research in astrophysics."

"Same."

"Engaged in academic research in astrophysics." Lu Bo said.

Xu Mang glanced at the two of them and fell into silence.

for a long time,

Xu Mang said apologetically, "I'm sorry...I'm afraid I will disappoint you."

......

Chapter 571 Are you Professor Xu? (2/3)

Xu Mang's words,