"Your new seat is behind me. Hao Tian ranked 29th in her class last month, and her progress was much lower than Xia Lu's, and no one improved faster than Xia Lu.

"Yes, behind you. There were too many materials, Xia Lu prepared a box, he packed all the items into the box, moved to his new seat, and then helped Hao Tian move things to her new seat.

The new seats of the two were separated by a row, and Hao Tian turned his head about 135 degrees to the right back, and his eyes could only vaguely see Xia Lu's side face through the gap between Zhang Chenghua and Li Yibo.

The third (5th) class of high school is like this, how many pairs of CPs go to their own things, two months is a reincarnation, and it has long been used to dividing and combining, if there is a fate, there is a day to get together.

Xia Lu's new seat was in the penultimate row near the back door of the classroom, and the new table mates were boys.

"Xia Lu, you're here. "The boy's name is Lin Wei, tall and mighty, myopic eyes are 800 degrees, and he wears quaint glasses.

"Yes, I'm here. Xia Lu nodded.

The first formal meeting between the two men in their 590s took place in a calm atmosphere, without licking each other or damaging each other.

As the saying goes, if you brush your questions, I will memorize my books, and it is true that it is plain.

February is a big month, and the graduating class of senior high school has entered the sprint stage.

Several key middle schools in the district, including Jiangcheng No. 2 Middle School, ushered in a wave of joint examinations at the end of February.

The joint entrance examination of several schools is a big event, and teachers, classmates, and parents of classmates attach great importance to it.

In the eyes of experts in the district education system, there is basically no difference between the joint entrance examination and the college entrance examination only from the evaluation of the paper.

The questions of the joint examination papers are handled by mysterious people, and this group of people makes a living by designing questions, and it is OK for them to put the questions directly on the college entrance examination papers.

"The joint entrance examination is equivalent to the college entrance examination, and I hope that students will do their best. ”

This is the lecture of the senior class teachers before the joint entrance examination.

On the first day of the joint entrance examination, Xia Lu played normally.

On the second day of the joint entrance examination, the comprehensive examination.

Chemistry and biology, Xia Lu also played normally.

Physics has some trouble.

There is a physics question that is short and concise, and there is no illustration, but it occupies a score of 12 points.

"It has been proved that the phase velocity vp and group velocity vg of X-rays in matter follow the following relationship: vpvg = c^2. where c is the speed of light in a vacuum. ”

Xia Lu was itching, and he really wanted to get these 12 points.

As mentioned by Mr. Chen, it is easy to prove that "phase velocity multiplied by group velocity equals the square of the speed of light" from the definition of phase velocity and group velocity, as well as the dispersion formula applicable to X-rays.

But the problem is that about this type of optical topic, Mr. Chen talked about such a core idea in class, and Mr. Chen did not mention a word about the specific proof method.

Xia Lu originally wanted to consult Teacher Chen, but you took me for a fool and directly taught me the specific proof method, okay?

It's a pity that before I could say this sentence to Mr. Chen, the joint entrance examination began.

12 points, it's very fat, it's a pity not to slaughter it.

Xia Lu can only bite the bullet, anyway, all the chemistry and biology questions are done, there is still half an hour left in the comprehensive exam, do a physics problem and calculate one, I fill the test paper, it is always possible to get a few steps in the derivation process, right?

First of all, Xia Lu must make a clear point: multiply the phase velocity by the group velocity, which must be equal to the square of the speed of light.

Based on this absolutely correct and impossible optical principle, let's play freely.

vp=c/n can be obtained from vp=c/√1-kλ^2

And then from what wavelength, what can be obtained.

In summary, vpvg=c^2 is true.

I don't know if it's right, anyway, Xia Lu forcibly proved that "the phase speed multiplied by the group speed equals the square of the speed of light".

+1 for high school physics literacy.

Yoh?

That's +1.

Looks like I've proven it right!

Xia Lu's confidence has increased greatly, there are 5 minutes left, how many more points is a few points!

As shown in the figure, a small coaxial disc with a radius of one-half of the radius of the original disc is cut in the middle of the rigid disc with uniform mass, and a small gap is formed between the small disc and its outer ring, and although the width of the gap is negligible, it makes only point contact between the small disc and the ring, and the small disc and the ring are placed on the horizontal ground...... Let μ=0.2, try to calculate the velocity of the system in the horizontal direction at the end. ”

This question...... I'll do this problem! I think about it, I can really do this mechanics problem! These 15 points are simply given for nothing!

Hahaha!

Xia Lu was ecstatic in his heart, he picked up a pen and wrote an R, and the handing bell rang at this time.

Depressed, alas, there is no time.

The title statement of this mechanics question was verbose, and it took Xia Lu nearly 5 minutes to review the questions and drawings, and the remaining time to answer the question was only enough for him to write an R.

A lone R wandered on the roll, apparently not even scoring 1 point.

The answer time is so rushed, and the physics questions are not all written, which shows that Xia Lu's level in physics still needs to be improved.

Two days later, the results of the JAE were announced.

140 points in Chinese, 124 points in mathematics, 130 points in English, 235 points in science, and a total score of 629. This is the result of Xia Lu, who broke the 600-point mark.

Ranked fourth in the class, 30th in the class, and several schools also ranked high overall.

Xia Lu was satisfied with this result, but he was also obsessed with the mechanics question, and when he got 15 points for that question, I was the first in the class.

From this moment on, Xia Lu's identity and status have undergone essential changes.

Judging from the absolute score, from the ranking, and from various data, Xia Lu now belongs to the academic class.

A scumbag with more than 300 points has become a top student with more than 600 points.

This kind of thing has happened in history, and the specific details will not be described, and the summary is that the prodigal son will not change his money, and it will never be too late to make progress in his studies.

However, it only took Xia Lu four months to improve his score by nearly 300 points.

The more intuitive explanation is that a scumbag who is difficult to pass the test even in the three main lines can now be admitted to key universities steadily. If he hadn't made low-level mistakes in the two days of the college entrance examination.

From more than 300 points, to more than 400 points, to more than 500 points, all the way to the current 629 points.

Xia Lu is making great progress every month.

It's scarier than playing consistently.

When is this a head?

Where is the upper limit of Summer Road?

With these doubts, the principal of No. 2 Middle School met Xia Lu for the first time.

In this joint entrance examination, there are so many students with 600 + points in the whole school, and there are as many as 29 people in front of Xia Lu, and some people even get 700+.

Why did the principal just summon Xia Lu, because Xia Lu is an inspirational character.

Before that, Xia Lu didn't have the opportunity to talk to the dean of academic affairs alone.

Today, he came directly to the principal.

The principal of Jiangcheng No. 2 Middle School, an education expert in the province and a representative of the two sessions, said with a pleasant face: "Hello Xia Lu, can I talk to you?"