When light causes charge oscillations on an electric charge, a driving force is generated in the direction of the beam i.e., radiation pressure or light pressure.

From the momentum generated by each absorption and radiation of an atom, we get:

2＜△p^2＞=2ћ^2*ω0^2/c^2

So the total momentum change in time t is:

2＜△p^2＞

So the change in cooling momentum of the atom is:

p0^2=12＜△p^2＞γpm/（2β）=3 ћmγ[2∣δ∣/γ+γ/2∣δ∣]/4

The propulsive momentum transferred by light per second is equal to 1/c multiplied by the energy absorbed from light per second, i.e. the momentum transferred by light is always :

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Shen Qi wrote all over the blackboard on the left, and he also wrote a small half of the blackboard on the right, and the chalk was broken.

In the laboratory, Mr. Mu and other team members were watching Shen Qi's performance.

Shen Qi's personal experience when he participated in the mathematics competition last year was that it was OK to play the provincial level at the level 3 level.

Level 6 Mathematics has a certain true bonus to lower Level Physics, and the system is set up like this. Under the care of Math Dad, Shen Qi's physical combat ability has been increased compared to the current level.

If this is a physical symphony, Shen Qi's performance in front is great, at least it seems.

After a blackboard deduction and explanation, Shen Qi gave the answer, the minimum temperature value is:

Tmin=2.4*10^-4K

That is, 2.4 times 10 to the minus fourth power Kelvin, which is a value very close to absolute zero.

"Solved. Shen Qi put half of the chalk into the groove and patted the chalk ash on his hand.

Smack, Teacher Mu habitually snapped his fingers: "The answer is correct, smart." ”

"Teacher Mu, only in the laboratory, can you see 2.4 times 10 to the minus fourth power, right?" Shen Qi and Teacher Mu exchanged ideas.

"In 1985, Mr. Zhu successfully completed the laser cooling experiment of atoms, and the experimental temperature at that time was exactly 2.4 times 10 to the minus fourth power. Today, in the 21st century, scientists can already achieve cooling in the laboratory on the order of picoKelvin, that is, one trillionth of a degree above absolute zero. Applied physics is developing rapidly, but theoretical physics is the foundational support. "She also has idols, and those physics bulls are her idols.

"Physics is all true, right?" Shen Qi asked again.

Teacher Mu was very firm: "Of course!"

After doing it for a long time, Mr. Mu cited Mr. Zhu's experimental case. Shen Qi turned around and glanced at the blackboard, it was a little interesting, physics was actually a little interesting.

Mr. Mu said with a smile: "When it comes to the national finals or international competitions, those teachers who have written questions are very keen to adapt the Nobel Prize in Physics cases of previous years, and it doesn't hurt to broaden their horizons, isn't it?" ”

"Definitely. Shen Qi nodded.

Teacher Mu and Shen Qi had questions and answers, chatting and laughing, and more than a dozen competition team members in the audience were dumbfounded.

"Why is Shen Qi's physics so strong?

"Could it be that we are studying fake physics?"

"I can't mess with it. ”

"I can't afford to mess with it. ”

"Big guy. ”

"Absolute big guy. ”

"My competition team is gone, and there is no ......"

There was a wail in the audience, but the team members admired Shen Qi very much, this mood was more complicated, and it was difficult to explain.

"Asked. Shen Qi bowed his hand respectfully to Teacher Mu.

"Sorry. Shen Qi hugged his fists at the dozen or so competition teams in the audience, and then turned to leave.

"Hey, Shen Qi!" Teacher Mu chased out.

The team members stared wide-eyed: "Kill one person in ten steps, don't stay for a thousand miles!"

"Brush off your clothes and go to hide your merit and fame!"

"I'm wandering in the moon, and I'm dancing in a mess!"

"The long wind is tens of thousands of miles, blowing through the Yumen Pass!"

"There are characters in the second, and the big guy's name is Shen Qi!"

"It's so exciting to run away after pretending!"

The players in the laboratory had a falling out.

"Caught off guard, our competition team is all honest and responsible people, take classes well, don't recruit anyone and don't provoke anyone, Shen Qi, you rushed in is a photoelectric wave sweep, why is this!"

"Shen Qi, where are you and our competition team, you can come if you want, and you can leave if you want?"

"Bai Lingye, you coward, Shen Qi walked away, you beep a yarn, there is a kind of anal front just now!"

"What the hell am I ...... What's the matter?"

Suddenly, someone felt that something was wrong: "On the fifth day of the first lunar month of the Chinese New Year, Shen Qi didn't come early or late, why did he come at this time? There must be an inner ghost in our team! Lin Xingyu said, are you an internal ghost, did you bring the devil into the village?"

"Yes, it must be Lin Xingyu, Shen Qi sat next to him just now, and he is quite familiar with him!"

"Comrades, please don't get me wrong, I am a veteran when I join the team in high school, and I am extremely loyal to the competition team!" Lin Xingyu shouted that he was wronged, in fact, his heart was quite empty, he hurriedly put away Shen Qi's draft paper, this is the manuscript of the big guy, and he carries it with him to increase his combat effectiveness.

Outside the laboratory, Mr. Mu caught up with Shen Qi and asked, "Hey, this is leaving?"

Shen Qi said: "Today, on the fifth day of the Lunar New Year, I have to go to my uncle's house for lunch, his house is quite far away. ”

"It's a must to go to relatives, it's normal for people to be human, Shen Qi, do you still participate in this year's math competition?" Mr. Mu asked.

Shen Qi shook his head: "I'm not going to participate, I've got everything I should get, and in the next few months, I'll probably forget about math for a while." ”

"Idle is also idle, come to the competition team to play?" Mr. Mu was thirsty for talent.

Shen Qi was noncommittal: "Think about it." ”

"Don't, the physics competition will start at the end of March, the preliminary round. "Teacher Mu is eager for reinforcements.

"By the way, Mr. Mu, where did you get your PhD?" Shen Qi changed the subject.

Mr. Mu: "Department of Physics, Yan University. ”

"This ...... It turned out to be Senior Sister Mu!" Shen Qi was a little surprised, "Senior Sister, you are a female doctor from the Department of Physics of Yan University, why did you come to our school to be a teacher?"

"Is our school very poor, the city's key high schools are okay. Now our school is recruiting teachers, starting with a master's degree, and there is no upper limit. Hey, don't ask me, hurry up in a word, can't you come to the competition team, junior brother?"

"If you are Teacher Mu, then I will consider it. If you are Senior Sister Mu, then I won't think about it, come. ”

So Shen Qi became a member of the physics competition team of Nangang No. 2 Middle School.

In the nearly 100-year history of Nangang No. 2 Middle School, there have been students who have participated in more than one discipline competition, but there have never been students who have won the highest awards in different subject competitions.

While talking and laughing, Shen Qi joined the competition team of Nangang No. 2 Middle School, even if he pretended to be forced to the sky, he could win awards in two subject competitions at most in his high school career.

There was not much time left for Shen Qi.

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(Today's Chinese New Year's Eve, during the day, I help my niece do my elementary school winter vacation homework at a relative's house, and eat a reunion dinner at night to watch the Spring Festival Gala, I can't write a word, this chapter is a manuscript, automatically uploaded, and today is a chapter.) I wish you all a happy Chinese New Year and all the best)