(Foreword)

The so-called coincidence means that it is there for you when you are desperately searching.

(Text)

April 16, 2021 at 11:32 a.m

It's been more than ten days since the last explosion at the U8 department store, and I'm almost in good health. But lately, I always feel that my brain will be in a trance from time to time, but I can't say why.

"Thousands of years have passed, and I have never forgotten each other's vows..."The mobile phone on the bedside table rang.

Recently, I can't remember what a very popular idol group is called, but I like the song sung by this group so much that I use it as my phone ringtone.

I picked up my phone, and a very familiar voice came from inside: "Cheng Yin, you can't still sleep, right?" Have you forgotten what day it is?

"What important day?"

"What is the important day?!Today is the day of your interview at the University of Science and Technology!!

"What! It's Friday! I patted my head and looked at the calendar on the wall. How could I have completely forgotten such an important day.

I put down my phone and quickly washed up, put on my coat and rushed to the University of Science and Technology.

The weather was fine at noon, but I wasn't in the mood to care about the scenery around me.

"Taxi !!" I flagged down a city taxi on the side of the road.

"Master, University of Science and Technology Development, Fast !!"

I looked at the watch on my wrist and my heart was about to jump out, it was 1 p.m., and it was 12:20 p.m. I don't want to lose the opportunity to enter a university for science and technology development.

"Young man, don't worry, I promise to arrive in half an hour." I was slightly relieved to hear the driver's words.

April 16, 2021 at 11:49 a.m

The taxi stopped on time at the entrance of the University of Science and Technology.

As soon as I got out of the car, I saw Yan Xiaoxue at the door shouting, "Cheng Yin, here, hurry up!! ”

I rushed to her.

"Cheng Yin, where is the location of the interview, I am familiar here, I will take you there."

I took out an interview notice from my bag:

At 1 p.m. on April 16, 2021, on the 5th floor of the first teaching building of the University of Science and Technology Development

"Yan Xiaoxue, where is the first teaching building, take me there." I looked at my watch at 12:52.

Yan Xiaoxue took me non-stop for about 6 or 7 minutes, and we came to the first teaching building.

"Cheng Yin, hurry, let's go up quickly!"

We ran to the 5th floor in one go.

A man's voice came from the first classroom on the side of the corridor: "Cheng Yin hasn't come yet, professor, or even if he doesn't pass, right?"

"Young people, we must always give them more opportunities, and the development of the times still depends on them after all." The voice is so familiar.

I finally stood at the door of the interview room and knocked softly.

"I'm a candidate for an interview, my name is Cheng Yin, I'm sorry, I'm late."

"What time do you think it's this classmate?" A middle-aged man with glass-eyed eyes said, looking at the watch in his hand.

"I said Professor Li, young man, since he is here, let's give him a chance, shall we?"

The person who spoke was none other than Professor Wu from the last lecture.

"Since Professor Wu said so. Alright then, you come in, we're going to start the interview. ”

There are three desks next to each other in the classroom, each with a piece of paper and a pen, and a bottle of water next to the pen. The three professors each looked at the paper in their hands, and as soon as I sat down on the chair, the professor with glass-eyed eyes raised his head and said, "Cheng Yin, what is the old quantum theory?"

I looked at the professor first. Wearing a sky blue long-sleeved shirt and black trousers. Holding a black pen in his hand.

"Good afternoon, professors, the so-called [1] old quantum theory includes Planck's quantum hypothesis, Einstein's quantum theory of light, and Bohr's atomic theory.

In 1900, Planck proposed the radiation quantum hypothesis, which postulated that the exchange of energy between the electromagnetic field and matter was realized in the form of discontinuities (energy particles).

In 1905, Albert Einstein introduced the concept of light quanta (photons) and gave the relationship between the energy and momentum of photons and the frequency and wavelength of radiation, successfully explaining the photoelectric effect. Subsequently, he proposed that the vibrational energy of solids is also quantized, thus explaining the problem of specific heat of solids at low temperatures.

In 1913, Bohr established a quantum theory of the atom based on Rutherford's original model of the nuclear atom. According to this theory, the electrons in an atom can only move in discrete orbits, and the electrons neither absorb nor release energy while moving in orbits. An atom has a definite energy, and the state in which it is located is called a "stationary state" [1]...

……”

"Cheng Yin said it very well. Looks like you've done a lot of homework, hehe. "Professor Wu's words instantly filled me with confidence.

After that, I basically answered the questions fluently. The faces of the three professors all showed affirmation,

"Cheng Yin's understanding is very profound, and his perspective on things is also very special. The most important thing is that the love for quantum physics probably exceeds that of all of us. Professor Wu looked at the other two professors and said.

"Yes, heroes are teenagers, it's rare to have such an understanding at such a young age."

"That's what Professor Wu and Professor Li said, and I think so too."

Several professors nodded in praise.

In this way, there is basically no problem in admitting to a university for the development of science and technology. I was indescribably happy.

"Okay, Cheng Yin, today's interview is over here, you go back and wait for the official admission notice." Professor Wu stood up and sorted out the notebook on the table.

The other two professors also began to organize their things.

It seems that I was the last student to interview today. I picked up my bag and was about to get up and leave.

At that moment, Professor Li's black pen rolled off the table. I saw him bend down and reach for the pen. The arm of the right hand reveals the grapefruit of the shirt. My bag almost slipped off, and I could faintly see a scar-like mark on his arm. Since the sleeves were only a little exposed, I couldn't quite see it clearly.

I looked at Professor Li in front of me, could this person be the "Z" Professor we had been looking for? Professor Li seemed to notice that I was looking at him, and hurriedly picked up his book and walked out of the classroom.

"Professor Wu, Professor Li and I still have a topic to study, so let's go first."

"Okay, we'll talk about the last study when you have time."

"Okay, Professor Wu, you're busy." With that, another professor also left the classroom.

Just when I was still thinking about Professor Li. Professor Wu walked up to me.

"Cheng Yin, are you free now? Let's go to the school cafeteria for a bite to eat, you see we haven't had lunch all morning. ”

"Well, I didn't have lunch either."

"That's great, I have something else to tell you."

"What's the matter?"

"It's just that there is a scientific research society on the twentieth that I don't know if you're interested?"

Scientific Research Society of the Twentieth. Three letters immediately appeared in my head.

A—E—F!!!

[1] ——Excerpt from Baidu Encyclopedia "Quantum Mechanics"