I really don't want to lie down and win

Then,

The professor returned to the podium and began to continue the lecture.

"..."

"..."

Xu Mang looked at Du Yuan, Du Yuan looked at Xu Mang, neither of them spoke.

"brother!"

"You're so fucking awesome!" Du Yuan said to Xu Mang with admiration, "Don't say anything, I'll treat you at noon."

Xu Mang smiled wryly, "You...how did you get into Nantah University?"

"I'm pretty good at mathematics, but I don't know anything about the sky." Du Yuan sighed: "If it wasn't for messing with a thesis, why would I study astrophysics?"

"..."

"Thanks for your hard work."

at this time,

The professor posed another problem.

"A pulsar is a neutron star that rotates at a high speed. The rotation speed of a pulsar is very fast, and some can even reach more than 1000 revolutions per second. Such a fast rotation, coupled with the magnetic field and extreme conditions, will make the poles of the pulsar collimate. electromagnetic radiation."

"Here is a question for you. Who can use digital calculations to prove that a pulsar is a neutron star?" the professor asked, "Think about it."

Xu Mang sat in the last row, watching everyone's bewildered expressions, just like when he was in the past.

in fact,

Astrophysics is a brand new major that can only be accessed in colleges, and only in top universities. These students are also unlucky... High school doesn't teach these things at all.

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 definitely be eliminated.

"Paper and pen!" Xu Mang said.

"Oh..."

Du Yuan hurriedly handed it to Xu Mang.

quickly,

Xu Mang used simple Newton's law of universal gravitation and centrifugal force formula to give a calculation proof that a pulsar is a neutron star. In fact, he only needs to master one concept. The centrifugal force of a pulsar is less than that of gravity, otherwise the pulsar will disintegrate.

According to this concept, very detailed calculations can be carried out through the law of universal gravitation and the formula of centrifugal force.

The relationship between the pulsar density p and period P is p>3πP2xG, G is the gravitational constant.

If the period of the pulsar in the Crab Nebula is 33 milliseconds, the resulting density is 1011 gcm3, which is greater than that of the white dwarf; if the period of the fastest rotating pulsar is 1013 millisecond, then the density is 3 gcm[-].

close to density estimates for neutron stars.

"Give!"

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

Du Yuan: Σっ°Д°;っ

OMG!

Is he really Einstein reincarnated?

"Cough cough!"

"Professor!" Du Yuan took Xu Mang's answer and shouted at the professor, "I've proved it."

"???"

"???"

"???"

What the hell!

Who is this guy?

Are you really an auditor?

Everyone stared at Du Yuan, only Xu Mang stared at the incandescent lamp on the ceiling with a dazed expression.

The professor hurried to Du Yuan's side, looked at the answer in his hand, looked at it carefully for more than [-] seconds, and said seriously: "Student... Are you sure you are from the Department of Mathematics? Could it be that you lost your memory? Actually, you From the physics department?"

"..."

"Professor, I really came here to listen." Du Yuan said helplessly: "Is the proof result correct?"

"Perfect!"

The professor smiled and said, "Unexpectedly, there is a genius among the auditors."

In addition to emotion,

The professor returned to the podium and continued lecturing.

"Neutron stars are not only 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 circumstances, this may not be true, because after the sun collapses, it can only form a white dwarf."

"If the sun compresses the neutron star, 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 genius student sitting in the last row, go to the blackboard and calculate the magnetic field conversion between the sun and the neutron star."

Du Yuan was stunned, he didn't even know the strength of the sun's surface magnetic field, how could he calculate the magnetic field conversion between the sun and the neutron star.

The previous two acts of coercion were all based on the answers provided by Xu Mang.

Now...

To calculate in front of everyone, isn't it forcing people to hang themselves!

Sure enough, pretense is risky!

"I..."

"This..." Du Yuan, a fake astrophysics genius, no longer knew what to do.

"classmate!"