When Li Yuzhen took Hu Xueyan and Lai Chang to visit Dashang Light Industry, Wang Yi was shocked to death at this time.

Today is the first spring rain, spring thunder showers, rain torrential. Wang Yi stood by the window with his back hand, looking at the interweaving of light and light outside, which seemed to herald the arrival of a new era.

At this time, a boy of about twelve years old was sitting on the sofa, a little cramped and uneasy. He held an exercise book in his hand, revealing pages with dense calculus and formulas. His name is Cao Yuexin, a student at the Affiliated Primary School of Dashang. To be honest, Wang Yi had some impressions of him, because this child's expression skills were very weak, but his performance in mathematics was eye-catching, but Wang Yi didn't know that he actually taught himself physics and chemistry in the library. And when I came to find Wang Yi today, it was obviously the courage that I had been mustering for a long time.

Wang Yi turned around at this time, walked back to Cao Yuexin's side, and said with a smile: "You are very good!" It's really good. ”

Cao Yuexin's originally nervous face, which was about to turn into wood, finally showed a smile. It's strange to say, in fact, Wang Yi is younger than Cao Yuexin, but I don't know why, Cao Yuexin is full of respect for Wang Yi.

The subject knowledge of this era is far less complicated than that of later generations, so the textbooks written by Wang Yi are only some large box things, so they are very simple, plus there is no pressure to go on to higher education, so students have a lot of free time. As for how they arranged this time, Wang Yi would not ask.

And most students like Cao Yuexin go to the library to learn what they like. Of course, on the other hand, there are many people who have nothing to do and basically eat students who are waiting for death. Wang Yi will not impose interference on such students, the reason is very simple, learning requires initiative, otherwise it will not be good at all. Even if Wang Yi uses a stick to force them to learn, so what, if they don't want to learn, they don't want to learn. I forced me to memorize it here, and then I turned my face and forgot about it. For this kind of student, Wang Yi's idea is very simple. When they graduate from junior high school, it is difficult for such people to pass the guò high school entrance exam. If they're lucky, they might be able to pass the recruitment exams and get a job. After that, if you want to be promoted to a position, you can rely on your qualifications in big business, don't even think about it. All senior positions are recruited by the unified examination, facing the whole society, written examination, interview, trial post, a total of three levels, after the salary increase and benefits, why do you want to go if you don't love it. The only way for Wang Yi to advance was the various training courses organized by Dashang in society. If after work, they are still unwilling to take the initiative to absorb knowledge, Wang Yi feels that they are not worried about themselves, but they are worried about something.

Speaking of which, Cao Yuexin is not considered to be the mainstream in the primary school affiliated to Dashang, he is very strict in his subjects, but Wang Yi is more of an encouragement to this kind of students. He doesn't care about students' biases, a person's brain is limited, and there will naturally be aspects that he is good at and what he is not good at. Yugong moving mountains may be a way, but in Wang Yi's opinion, instead of spending so much energy on what he is not good at, it is better to do a job that he likes and is good at.

Today, Cao Yuexin brought Wang Yi a physics paper written by himself, "A Little Conjecture of Light and Electricity".

To get back to the roots, this matter has to start from the beginning.

More than a year ago, Wang Yi successfully carried out the verification test of electromagnetic waves in the industrial laboratory, when the primary school affiliated to Dashang organized students to visit, and Cao Yuexin was one of them. What's more special is that when he visited, Wang Yi was also present. He was talking to a group of researchers in the real estate room of Dashang Industry and explained why it is easier to discharge when light hits the gap in the metal ring. The other students forgot about it when they heard it, but Cao Yuexin secretly remembered it in their hearts.

Because it was Wang Yi's question, many scholars in the industrial practice room carried out research in private. But it was good that they didn't do it, and they were all surprised to find that it was completely beyond their imagination.

The first thing that needs to be stated is that in the industrial room, all scholars already know about the storage of electrons. Because when making zuò diodes and transistors, Wang Yi has already given the principle. Later, Wang Yi presided over the oil droplets, and then gave the plan for the production of the cloud room instrument, which made it possible to shoot fast-moving electrons.

Back to the point.

When light hits a metal, it knocks out electrons that were originally bound to atoms on the surface of the metal. At that time, the scholars of the industrial laboratory did not know the reason, so they gave this phenomenon a name: the photoelectric effect.

Soon a series of realizations about the photoelectric effect were completed in the industrial chamber, and although most of them were crude and rudimentary, they nevertheless revealed two facts.

The first point is that for a particular metal, whether light can shoot electrons from its surface is only related to the frequency of light. Light at higher frequencies, such as ultraviolet light, is capable of producing higher energy electrons. Low-frequency light, such as red and yellow light, does not produce a single electron.

The second point is that whether or not electrons can be produced has nothing to do with the intensity of light. Electrons can be knocked out even in weak ultraviolet light, but it is also impossible to do it in strong red light. The increase in the intensity of the light only increases the number of electrons that are struck, which means that strong ultraviolet light can knock more electrons out of a metal surface than weak ultraviolet light.

Therefore, from these two points, it can be summarized as follows: for a particular metal, whether or not it can produce electrons is related to the frequency of light. And how many electrons are emitted is related to the intensity of the light. Based on the above facts, all the scholars engaged in this field of research in the industrial field are confused...... Because, it shouldn't be like this!

According to classical Maxwell's theory, light is a wave, and the stronger the wave, the greater the energy. If the result is changed to this, they will feel that it is logical. That is: the electrons are bound inside the atom, and if there is not enough energy, it is not enough to beat the electrons out. If the intensity of the light is increased, that is, its energy is increased, the electrons should fly out. And what is the frequency, that is, the frequency of the vibration of the wave, if the light vibrates more frequently, the more electrons should run out.

But the heavens do not fulfill people's wishes, and the result is the opposite!

Maxwell's classical theory is completely confusing and confusing about the photoelectric effect. Therefore, even the scholars with the real room of the Great Business Industry have the same expression.

I don't know if Wang Yi deliberately arranged it, or if it was purely a coincidence.

In the journal of the Industrial Laboratory, Wang Yi published the photoelectric effect and his previously published quantum conjecture in the same issue. Because the journal is an academic newspaper, it mostly contains some introductions to new scientific and technological progress, but it does not publish various core patent projects related to the industrial practice itself. In addition to the inside of the industrial room, you can also read it at the Dashang Affiliated Primary School.

Cao Yuexin was very interested in the content of this issue, and after taking it back, she returned to the dormitory in a hurry. There is a student named Zhao Di in his bed, and his studies are not bad, he is not too biased, but he is a little high. He was lying in bed, reading a botanical book. And the other two people who slept together, one was named Ye Tao and the other was Han Huan. Ye Tao is similar to Cao Yuexin, but he is biased towards liberal arts, likes history, geography and archaeology, and has a nickname in the bedroom called tomb robbers. Han Huan is a little more different, with a wide range of hobbies, astronomy, geography, biology...... The door will be, the door is not fine. If you talk about strengths...... There are also, that is, interpersonal communication, typical self-cooked.

After greeting the three people who slept with him, Cao Yuexin went through some freshening, and at this time he was lying on the bed, browsing the journal. He first read Wang Yi's conjecture about quantum, and it wasn't until three or four times later that he understood the content. Later, he read about the photoelectric effect, but unlike Wang Yi's quantum hypothesis, the papers on the photoelectric effect are all about the actual yàn results, which is not the slightest difficulty for Cao Yuexin.

At this time, he turned over and lay on his back on the bed, covering his face with the journal, recalling in his mind what Wang Yi had said in the electromagnetic wave verification laboratory.

"You see, in the light, the notches of the metal rings are more prone to electric sparks. When you get back, study the reasons and remember, this is the key to a new era in physics! ”

These words always lingered in Cao Yuexin's ears, and unconsciously, the lights went out in the bedroom, and Cao Yuexin also fell asleep.

People have been misconceptions that when you sleep, your brain rests with you. But in fact, sleep is just a time for the body to rest, but the brain is more active than usual. During this time, he is responsible for administering various hormones and regulating various signals. Of course, there is one more important function, which is to dream!

Cao Yuexin was dreaming at this time, and the first dream was the commentary "Journey to the West" that he heard in the cafeteria at dinner today, which was about the scene of havoc in the Heavenly Palace. But I don't know when, Sun Wukong suddenly became a quantum hypothesis, and Erlang God became a photoelectric effect, and the two crackled together, and finally began to merge inexplicably. Well, that sounds a bit sentimental.

Cao Yuexin, who was asleep, suddenly woke up and broke out in a cold sweat inexplicably.

He seemed to have something in mind...... A little something......

It was dark at this time, and there was still more than an hour before dawn. Cao Yuexin's heart felt like someone had lit a fire, and she couldn't sleep. He put on his clothes, took his notebook, moved a stool, and thought about bringing the journal with him. The other three people who slept together just turned over in a daze, while Han Huan said two unclear dream words, and they all fell asleep.

There are lights in the hallway, but the wattage is very low, and you can see things clearly, but it is a little tiring to the eyes.

Cao Yuexin sat in the light, biting the head of her little pencil, thinking about the little thing she thought of when she was dreaming, but she seemed to have no clue. Later, he simply stopped recalling what he had in mind, but took the journal and looked at the above description of the photoelectric effect again, and at the same time compared it with the electromagnetic theory he knew.

The electromagnetic theory holds that light is a wave whose intensity represents its energy, and increasing the intensity of light should be able to knock out higher energy electrons. But the real yàn shows that increasing the intensity of light can only knock out more electrons, but it cannot increase the energy of electrons. In order to shoot higher energy electrons, it is necessary to increase the frequency of the light.

"What's going on?"

Cao Yuexin was a little engrossed in his thoughts, so much so that the chair leaning back lost his balance for a while and threw him to the ground.

The journal was thrown high at this time, and immediately floated down, as if it was a notice from heaven, and the quantum hypothesis appeared in front of Cao Yuexin's eyes!

"Raise the frequency, raise the frequency ......"

Wang Yi wrote in the journal that there is a simple equation to determine how much energy is contained in a "quantum" of a particular radiation frequency.

E=hv。

E is the energy, h is the king coefficient (that is, the original Planck coefficient), and v is the frequency!

Cao Yuexin's eyes were straight for a while!

"Frequency! Aha, frequency! E=hv, isn't this the relationship between energy and frequency, isn't increasing frequency increasing energy? The principal has already published the answer in the journal! Cao Yuexin shouted cheers in the corridor!

But the response was a roar of rage!

Cao Yuexin hurriedly fled!

With this formula, everything is easily solved, and it is logical! Later, Cao Yuexin deduced a new formula: 1/2mv^2=hv-P.

1/2mv^2 is the maximum kinetic energy of the excited electron, hv is the energy of a single energy n, and P is the minimum energy required to excite the electron.

In the office, after seeing Wang Yi's smile, Cao Yuexin finally relaxed.

"Tell me about your understanding of this formula, and your understanding of the photoelectric effect!" Wang Yi poured Cao Yuexin a cup of tea and told him not to be nervous.

"When a ray of light from a point travels through an ever-expanding space, its energy is not continuously distributed, but consists of a finite number of 'energy particles' confined to a certain place in space. These energy particles are indivisible, they can only be absorbed or emitted in their entirety. If we look at it from the point of view of energy subs, the photoelectric effect can be explained. According to the formula, ultraviolet light has a high frequency and therefore has more energy, so its energy particles act on the surface of the metal, and they can release the electrons inside, and obtain more energy electrons than other frequencies of light. But for low-frequency light, no matter how many energy particles are emitted, each of them is not enough to excite electrons, so it is useless to give more energy molecules. ”

Wang Yiyi laughed, then patted Cao Yuexin on the shoulder, and said, "Very good, very good!" Maybe we should give your energy child a name! ”

Cao Yuexin nodded and said, "Then what does the principal think should be called?" ”

"Since it's light, how about calling it a photon?"

"Photons?" Cao Yuexin pondered for a moment, laughed, and said, "It's called Photon!" I love the name! ”

When the scholars of the Dashang Industrial Reality Room got the new issue of the journal, when they saw that the photoelectric effect that had been entangled with them for a long time was solved by a little-known elementary school student of the Dashang Affiliated Primary School, the shock and absurdity were probably indescribable!

After this incident, Wang Yi gave Cao Yuexin a large scholarship, and awarded him a special contribution award at the school's school meeting in front of all teachers and students. But all the rewards end here, Cao Yuexin should go to class every day, and he should study and study. Wang Yi didn't let him skip a grade, at what age to do something, people's growth is not only the growth of knowledge, but also the growth of experience and communication in the world. There are some things that only peers can give, peers can learn, peers can understand, throwing a child into another age group, either let it age faster, or let it die quickly, that is to promote the seedlings!