Chen Ya smiled and said:

"Lao Yang, I think you regard me as a god. I have never studied higher education for a day, and I have never applied for a job. How do I know which major is good and which one has a bright future?"

Yang Changshuo pointed at him with his finger and said:

"Look, this slick guy is still hiding his secrets. He is a bad guy."

Chen Ya smiled and said nothing.

Yang Changshuo smiled and said to Mei Han:

"Little girl, please beg him and let him tell you how to choose. This guy has a copper head and an iron arm, but he can't stop a woman from begging. If you beg, it will definitely work."

Mei Han listened carefully and nodded, then turned to look at Chen Ya, but hesitantly.

If, as the other person said, he didn't even go to junior high school, then what's the point of asking him?

Mei Han looked at this boy who was not much younger than herself and didn't know how to open her mouth for a moment.

Chen Ya seemed to notice her embarrassment, smiled, touched the dial of the watch in his hand, and said:

"I'll give you two questions first to see how your basic skills are. How about that?"

When she heard that she could do the questions, Mei Han became serious and nodded.

Fang Bai blinked.

A person's level of answering questions can also reflect his or her own academic level.

She was a little curious about what kind of question the famous Bai Yujing would come up with.

As soon as Xia Zhijian heard that there was going to be a physics question, he knew it had nothing to do with him, and he looked a little sad.

Yang Changshuo lowered his eyebrows and could not tell what he was thinking.

Chen Ya lay comfortably on the sofa and said:

"We assume that the sun is about to experience a helium flash and will soon be destroyed. The solar system will become uninhabitable for humans. Now humans must immediately save themselves..."

As soon as the first sentence came out, the expressions on everyone's faces became wonderful.

Especially Xia Zhijian, who had originally planned to hide his name, immediately became energetic.

"Mankind's self-rescue plan is called 'Wandering Earth', which is to install engines on the surface of the earth to push the earth out of the solar system and to Proxima Centauri, a star 4.22 light-years away from the sun."

Everyone, please go and try it soon.】

"If you are the person in charge of the 'Wandering Earth' project, please formulate a plan."

When she first heard the title, Mei Han's expression was very strange.

But she endured it. After all, some physics competition questions also have strange backgrounds.

It wasn't until she heard the whole question that her face completely turned stiff.

Fang Bai spoke up: "Mr. Bai Yujing, is your question really a physics question?"

She felt that by asking such a question, Bai Yujing was trying to make things difficult for others?

"This is a physics question." Chen Ya said with a smile, "You can use your mobile phone to search for known physical quantities, such as the mass of the earth, the distance from the sun, etc. But the quantities that need to be calculated, such as the speed of the third universe, need to be calculated in writing."

Fang Bai raised his eyebrows.

He was actually serious.

Helium flash is a short-lived thermal runaway phenomenon of nuclear fusion. As the hydrogen element inside the star is gradually depleted, the remaining helium element will be compressed into degenerate matter. The characteristics of these degenerate matter are that the increase in temperature will not cause

The volume of matter increases until the thermal pressure becomes so high that it exceeds the degeneracy pressure, and helium fusion occurs.

Helium fusion will occur inside the core of the star, which will drastically increase the core temperature of Hengxin. This will produce a very strong helium fusion flash, which will release within a few minutes the equivalent of the total energy released by the entire galaxy at the same time.

After a helium flash occurs, the earth's surface will no longer be suitable for human habitation.

The idea of ​​using an "engine" to propel the Earth to "wander" in the universe is even more outrageous. What level of energy is required for the Earth to reach escape velocity? How many years will it take to wander to Proxima Centauri?

This is just the general background of the topic Bai Yujing mentioned.

Just describing this background would already require all the physics education in high school. The test of Bai Yujing's entire topic is far more than that.

Mei Han stayed there for a minute.

Because this topic is too unimaginative and grand, I just want to briefly conceive of it.

A minute later, she suddenly realized that this question was not unreasonable.

The implicit condition of the "Wandering Earth" plan is to preserve as much of the human fire as possible and "drive" the planet to its destination as quickly as possible.

The basic physical quantities Bai Yujing told her just now that she could search for were actually a reminder, such as the circumference of the equator, the velocity of the third universe and other data.

She gradually had an idea of ​​how to make a plan.

Yang Changshuo silently took a thick stack of white paper from his desk and placed it in front of Mei Han together with a pen.

Mei Han said nothing and began to calculate on the white paper.

Chen Ya looked at his Patek Philippe watch with Galaxy on the dial, and the hour hand had just passed two marks.

Xia Zhijian finally couldn't help it and asked: "Mr. Bai Yujing, if we drive the earth away like a car according to what you said, what will happen to the people on the earth?"

Chen Ya said: "Dig underground cities underground, and all human beings will go underground to survive."

Xia Zhijian said in astonishment: "Wouldn't that mean that the entire country, society, and even the international community are in chaos?"

Chen Ya said: "Yes, this is actually a test of ethics, international politics, and social order. Maybe you can also try to formulate a plan to maintain a relatively stable order."

Xia Zhijian said desperately: "Mr. Bai Yujing, you are too difficult for me."

After saying that, he couldn't help but think about what kind of structure should be adopted in order to maintain the order of human society when the end of the world approaches.

...Mei Han was lying on the coffee table, her head was hot and her face was red.

The more she calculated, the more difficult she realized how difficult the question was.

She has used all her knowledge.

This issue includes not only astronomy, but also mechanics, thermodynamics, electromagnetism, nuclear physics...

There was not a single data in the question, but after making the initial plan, Mei Han's calculation formulas were already listed on the entire manuscript paper.

This chapter is not finished yet, please click on the next page to continue reading the exciting content! Fang Bai took out a piece of white paper and started counting on his own paper.

The more she thought about it, the more interesting the topic became. She felt a little itchy, so she decided to do the math herself.

She also whispered to Principal Yang from time to time, but Mei Han was immersed in solving problems and didn't notice at all.

Chen Ya looked at his watch. When the hour hand completed exactly one mark, he said:

"stop."

Mei Han suddenly woke up and realized that she was sweating profusely and her manuscript paper had been taken away by Chen Ya.

"Well, you're qualified."

"I only calculated the basic plan," she said after swallowing her saliva. "First use the engine to stop the earth's rotation and revolution, and then let the earth reach escape velocity and fly out of the solar system."

"Before approaching the destination, it gradually slows down, then settles into the orbit of the new star and becomes a satellite of the new sun."

"After calculations, I found that it is very difficult for an object as massive as the Earth to reach the escape velocity, so I plan to use the gravitational slingshots of other planets to accelerate the Earth, such as Jupiter."

"This requires calculating Jupiter's Roche limit."

"But time was too tight. I only calculated the energy required to stop the autobiography, and the time was over."

"It's already very good," Chen Ya said, "I didn't want you to finish this question in the first place. The amount of work is too huge, and it is an impossible task."

Chen Ya continued: "Studying theoretical physics requires not only an amazing mind, but also a passion that lasts a lifetime, and more importantly, character. If you have calculated to this point, you have passed the test."

"However, if you don't stay for a minute at the beginning to think about the meaning of the question, the result will be better now."

After he finished speaking, Mei Han suppressed her blush.

Fang Bai also put down his pen at this time and sighed: "Impossible, this is an impossible task. It is impossible for the earth to successfully wander. Even if the surface of the earth is turned into a sea of ​​fire, it is impossible to push the earth to escape from the solar system."

She turned to Principal Yang and asked: "Teacher, you must have known this result from the beginning, right?"

Yang Changshuo smiled and said nothing.

He went through it in his mind for a while and calculated all the possible outcomes.

But some things are no longer fun if they are revealed.

Chen Ya asked: "Second question, please listen."

Mei Han stood ready, holding the pen tightly in her hand.

"In the future, do you want to take root in China, or do you want to go to the United States?"

After hearing this question, Mei Han put down her pen.

Somewhat unexpected.

This question has nothing to do with physics.

Mei Han glanced at Xia Zhijian and said:
To be continued...