Chapter 311

Accompanied by this classmate, Xu mang came to a classroom in the Physics Department building. As a result, he found a problem. The guy didn't bring books. There were about 60 people in the classroom, and about 10 of them had no books.

What's the situation?

Is this major a shoddy one?

"Brother?"

"Why didn't these people bring books?" Xu asked curiously.

"In attendance." The little brother said calmly, "it's almost like you."

"..."

"what about you?" Xu asked with a black line on his face.

"Me?"

"I'm in the audience, of course." "But I'm a little better at astrophysics than those of them, including you," he said with a smile

Sleeping trough!

Meet a pretender!

How dare you pretend to force me in front of Xu mang?

Xu mang is so angry that he has always been his own routine. As a result, he was given the routine by others today. The problem is that he was given the routine by a graduate student. This is the biggest stain in the history of his routine.

"Alas

"Do your family know you're so good?" Xu mang asked helplessly: "good guy... Clearly you are the same as me. How do you pretend to be an astrophysics major?"

"..."

"can't say that." "I may be a little bit better than you, of course... I mean maybe."

"Who is holy, brother?" Xu asked.

"Du yuan."

"Oh..." Xu mang nodded and said silently, "do you know who I am?"

Du yuan was stunned for a moment and said calmly, "who are you? It doesn't matter to me. You just meet by chance. Maybe after tomorrow, we will not have any intersection, so we don't know the name. It's better to be less concerned and more obsessive."

Xu Mang: (° ー)

hell!

Meet an equal opponent.

It feels like he's a psychopath.

Soon,

a very dignified professor came in and started the class without naming.

"Today we will focus on the physical properties of neutron stars." Although the professor is acute, but has a wealth of knowledge, from his hair and hair volume can be inferred, after all, extremely smart.

"When a massive star evolves to a later stage, it will accumulate a huge iron core through nuclear combustion. When the iron core reaches a certain mass, it will collapse due to excessive pressure, resulting in severe gamma ray bursts and supernova explosions, thus giving birth to a neutron star."

"In fact, a neutron star is a super dense star composed of neutron matter. How dense is the neutron star? I'll give you five minutes to estimate the density of neutron stars. First of all, neutron stars have a mass similar to that of the sun, with a radius of 10 kilometers. "

"The sun has a radius of 700000 km and a density of (1.4gcm ^ 3)."

"Let's start to count, it's five minutes," the professor said solemnly

Soon everyone began to calculate. Of course, there were about ten observers who were paid for nothing. They sat quietly in their seats, waiting for the answer to be announced.

Looking at the students at the scene, Xu mang felt confused and asked curiously, "well, this is a freshman?"

"How do you know?" Du Yuan said in surprise, "it's a freshman indeed."

"..."

"I don't know how to quickly convert two stars of the same mass. What do you say is not a new generation?" "When two stars have the same mass, their density is inversely proportional to the third power of their radius," Xu said helplessly

Du yuan Leng for a moment, a face of doubt said: "sure?"

"..."

"are you doing research in the Astrophysics Group "Don't tell me that you are only responsible for calculation?" Xu asked

Du yuan awkwardly nodded: "do you know the density?"

"Do you have a pen and paper?"

"Yes!"

I don't know where Du yuan took the pen and paper and handed it to Xu mang.

In less than 10 seconds,

Xu mang completed the calculation of neutron star density, PNS = (RRNS) ^ 3xp ≈ (70000010) ^ 3x1.4 ≈ 10 ^ 14 (GCM ^ - 3)

"here it is!"

After Du yuan got the answer, he looked at Xu Mang in horror and asked carefully, "brother... Right?"

"Try it." Xu mang shrugged his shoulders and said calmly.

The reason why Xu mang gives up the answer is that he doesn't want to bear the title of autistic maker any more. He wants to give this title to Du yuan.

Du yuan thought for a moment, then raised his hand in a hurry and yelled to the professor, "Professor, I'm done with it!"As soon as the voice dropped,

caused an uproar.

"Are you...

" auditor? " When the professor saw Du yuan and saw that there was no textbook on his desk, he understood that he had come to listen.

"Well!" Du yuan nodded.

Then, the professor came to Du yuan, took a look at his answer and said, "which department are you from?"

"Department of Mathematics..."

"graduate student, who happens to be in the astrophysics research group, is responsible for the calculation program." Du Yuan said seriously: "in order to strengthen the business ability, so I came to listen to your class. I have been listening to your class. I have always remembered your knowledge points."

Xu Mang: (￣ △;)

talent!

No,

this is a wolf kill.

"Not bad!"

"It's good to be self-motivated. Keep working hard." The astrophysics Professor nodded repeatedly.

Then,

the professor returned to the podium and began to lecture.

"..."

"..."

Xu mang looked at Du yuan and Du yuan looked at Xu mang. Neither of them spoke.

"Brother

"You're too much of a bull!" Du Yuan said to Xu mang with a face of adoration: "I won't say anything. I'll treat you at noon."

Xu mang said with a wry smile, "how did you get into NaNTU?"

"I'm good at math, but I don't know anything about astronomy." Du yuan sighed: "if it is not for the sake of mixing a thesis, ghosts will learn what astrophysics."

"..."

"hard work."

At this time,

the professor threw another problem.

"Pulsars are high-speed rotating neutron stars. Pulsars rotate very fast, and some can even reach more than 1000 revolutions per second. Such rapid rotation, combined with magnetic field and extreme conditions, will produce collimated electromagnetic radiation at the two poles of the pulsar."

"Here's a question for you. Who can use digital calculation to prove that pulsars are neutron stars?" "Think about it," the professor asked

Xu mang sits in the last row, witnessing everyone's face muddled, like his own past.

In fact,

astrophysics is a brand-new major, which can only be found in universities and top universities. These students are also unlucky... They have never taught these things in high school.

It means that everyone starts from scratch. In addition to the professor's teaching, they also need other channels to acquire knowledge, otherwise they will be eliminated.

"Paper and pen!" Xu said.

"Oh..."

Du yuan quickly handed it to Xu mang.

Very soon,

Xu mang used Newton's law of universal gravitation and centrifugal force formula to prove that pulsars are neutron stars. In fact, only one concept is needed to master. The centrifugal force of pulsars is less than gravity, otherwise pulsars will disintegrate.

According to this concept, we can make a very detailed calculation through the law of universal gravitation and the formula of centrifugal force.

The relationship between the density (P) and the period (P) of the pulsar is P3 π p ^ 2xg, and G is the gravitational constant.

If the period of pulsar in Crab Nebula is 33 ms, the density is 10 ^ 11 GCM ^ 3, which is higher than that of white dwarf; if the period of pulsar with the fastest rotation is 1 millisecond, the density is 10 ^ 13 GCM ^ 3.

It is close to the estimated density of neutron stars.

"Here you are

"It's done." Xu handed the answer to Du yuan.

Du yuan: ∑ (っっっ;) っ

My God!

Is he really Einstein's reincarnation?

"Cough!"

"Professor!" Du yuan took Xu Mang's answer and called to the professor, "I have proved it."

“？？？”

“？？？”

“？？？”

Sleeping trough!

Who is this guy?

Are you really an auditor?

Everyone is staring at Du yuan, only Xu mang looks at the incandescent lamp on the ceiling.

The professor came to Du yuan in a hurry, looked at the answer in his hand, looked at it carefully for more than 30 seconds, and said seriously, "classmate, are you sure you belong to the mathematics department? Can you lose your memory? In fact, you are in the Department of physics? "

"..."

"Professor, I really came here to listen." Du Yuan said helplessly, "is it right to prove the result?"

"Perfect!"

The professor said with a smile: "I can't imagine that there is a genius in the audience."

In addition to feeling,

the professor returned to the platform and continued to lecture.

"Neutron stars are not only very dense, but also have a very strong magnetic field. Let's take the sun as an example and compress the sun into a neutron star. Of course... Under natural conditions, this may not be true, because after the sun collapses, only white dwarfs can be formed.""If the sun compresses the neutron star, then its magnetic field strength will be..."

when the professor said this, he suddenly remembered a genius in his class and said with a smile: "the talented student sitting in the last row, please go to the blackboard to calculate the magnetic field conversion between the sun and the neutron star."

Du yuan is already confused. He doesn't even know the surface magnetic field intensity of the sun. How can he calculate the magnetic field conversion between the sun and the neutron star.

The previous two forced, completely rely on Xu mang to provide the answer.

Now...

to calculate in front of everyone, this is not forcing people to hang themselves!

As expected, there are risks in pretending to be forced!

"I..."

"this..." Du yuan, a fake astrophysics genius, has no idea what to do.

"Classmate!"

"Everyone is waiting for you. Please hurry up and don't waste everyone's time." "It's not difficult for you," the professor said with a smile

Xu mang looked at the poor man who was forced to hang himself and said helplessly: "remember... The conservation of magnetic flux means that the magnetic line of force on the surface of the star will be compressed. Calculate according to this concept."

Hearing Xu Mang's words,

Du yuan was more desperate.

Big brother!

I don't understand!

"Classmate!"

"Don't dawdle, come up quickly!" The professor urged.

No way,

Du yuan can only get up in silence, but his heart is suffering.

Just ready to take this difficult step, Du yuan suddenly awakened. Instead of being exposed on the spot, Du yuan now reveals the truth. Then he points to Xu Mang and says with shame: "Professor... I confess that the two answers before were given to me by this person. In fact, I can't do anything."

_ Prof. (° Д °), I report that he did it!

Σ (д '* ノノノノノノノノノノノノノノノノノノ?!

As the words fell,

there was an uproar in the classroom again.

What's the situation?

Three twists and turns!

The plot is so complicated that I can't understand it.

......

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