Dinner is still instant noodles, and this time I finally put poached eggs in it, which made Lin Fan, who was originally living a relatively poor life, even worse, but today is a big day, and I used knowledge to earn money for the first time.

Honestly,

Lin Fan felt a little guilty in his heart, in his eyes, knowledge is used to create human happiness, and as a result... Instead, he used it to defraud the in-game equipment and currency.

however

This guilt comes and goes so quickly...

When he finished eating braised beef instant noodles and poured a bottle of iced Coke, the carbon dioxide accumulated in his stomach was caused by the spasmodic contraction of the diaphragm to cause the gas to reverse from the stomach. Hiccup, after a long hiccups, Lin Fan collapsed to death in his chair.

"Ah~"

"Comfortable!"

"Instant noodles and coke, it's really the perfect match, don't accept refutation!" Lin Fan let out a long breath and turned his head to look at his door, not knowing what the refrigerator was eating... Belch... The refrigerator may be eating some electricity.

After a short break,

Lin Fan began to help Liang Xuchao solve their problem of calculating the momentum and expected kinetic energy of free particles.

Lin Fan has already seen the complexity of this problem before, it cannot be calculated using the momentum expectation value calculation formula, so... It is necessary to find another way to find other solutions, which is naturally difficult for Lin Fan.

As one of the best geniuses in the world, after thinking for a little for ten minutes, I came up with a solution.

There are two kinds!

The first is to use trigonometric formulas.

Its sinkx = 1/2i(e^ikx-e^-ikx), coskx = 1/2(e^ikx-e^-ikx), from which A/4(e^ikx+e^-ikx-e^i2kx-e^-i2kx), which shows that the state of the particle is actually a superposition state formed by the linear superposition of five plane waves, and then according to the principle of superposition state, the momentum of the particle at this time has five possible values.

p1=hk, p2=-hk, p3=2hk, p4=-2hk, p5=0...The expected value of the particle's momentum and kinetic energy is derived from this, of course... This step does not end there, because there is a normalization condition for the wave function, and the probability of the possible value of the particle's momentum must be equal to 1.

So far... Add A=(πh)^-1/2.

Come to an end!

In fact, it is now over, Lin Fan solved Liang Xuchao's problem in ten minutes, but there is another way, but it needs to use the Fourier transform, and then apply the sigma function relation, which can obtain the momentum and kinetic energy of the particle.

It's just that...

Lin Fan is worried that it will be too complicated, and Liang Xuchao's gang may not be able to understand it, but think about it... Can they use trigonometric functions to understand it? I guess they can't understand it.

Thinking of this,

The second solution is used to solve the problem of calculating the momentum and kinetic energy expectation of free particles.

It took less than ten minutes, Lin Fan solved everything, he used two solutions, almost each of them is the most perfect, if you have to choose one... Lin Fan may choose to use the trigonometric formula to solve the momentum and kinetic energy of particles, which is more pure and rigorous.

"Oops~"

"Isn't it too long since you used your brain? Lin Fan stretched, silently opened his computer, entered his account and password, and then logged in to his character and began to play in the world of Azeroth.

The hour hand is at the eleventh position,

Lin Fan turned off the computer, washed up briefly, and lay directly on the bed, thinking that he could have a legendary weapon, his heart was a little surging, and gradually... I fell asleep.

...

In the early morning of the next day,

A monotonous and tedious day begins.

Lin Fan learned the previous lesson and deliberately went out ten minutes early, in order to avoid meeting Liu Yun'er, but... I never thought that the other party thought the same way.

The moment you open the door,

Their eyes were intertwined, and the atmosphere dropped to freezing at this moment, and time had frozen.

“...”

“...”

As if agreed, the two didn't speak, silently closed the door, and then walked towards the staircase, Liu Yun'er walked in front, Lin Fan followed, although the two were in the same frame, they left a safe distance from each other.

During this awkward and tense time, Lin Fan smelled a fragrance... A fresh light fragrance.

"Are you using Chanel Modern COCO perfume?" Lin Fan said seriously: "In fact, this perfume does not match your image, it represents depth, sexiness, positivity, interpreting the other side of a woman's personality, low-key elegance versus baroque luxury, like the impact of black and white contrast." ”

"If you like light fragrance, I recommend you to use Miss Dior Eau de Toilette, as Dior's first fragrance, showing an infinite passion for flowers, I think..."

Lin Fan was halfway through speaking, and suddenly Liu Yun'er, who was walking in front, stopped and stared back at him... What does a big man want to do when he knows so much about perfumes?

At this moment,

A lot of pictures appeared in Liu Yuner's mind, and then Liu Yuner was angry with the pictures made up in her brain.

"Scum!"

Angrily dropped a word,

Liu Yun'er left straight away and disappeared from Lin Fan's field of vision.

Ay?

This is scum?

I didn't do anything!

How could Lin Fan know what pictures Liu Yun'er made up in his head, in short... He is very angry now, and kindly recommended a perfume suitable for her, but the other party did not appreciate it, and scolded himself for being a scumbag... Alas, what is wrong with this world?

Finally arrived at the unit,

Lin Fan directly opened the computer and inserted the USB flash drive... sent a document to Liang Xuchao's QQ.

In less than ten minutes,

Liang Xuchao's phone called, and his tone was a little dazed.

"Brother Ring?"

"Isn't that right?" Liang Xuchao looked at the content he sent over, and asked Lin Fan, "Is it reliable?"

"Remove the '?'... It's all that is reliable!" Lin Fan said angrily: "Don't forget to give me a black wind sword, and the 20,000 gold coins promised to me will be mailed to me at night, I have no money recently, and I can't even afford to buy potions." ”

“...”

Liang Xuchao slid the scroll wheel of the mouse and asked curiously: "What if it's unreliable? Who do you ask to do it?"

"Why are there so many questions?"

"Are you a hundred thousand why, or a blue cat naughty three thousand?" Lin Fan said helplessly: "Don't ask if there is such a thing, in short... Very reliable!"

Words fall,

Hung up directly,

Lin Fan didn't want to dwell on this matter for too long, man... Be decisive.

meanwhile

Liang Xuchao looked at this document and looked at it for a long time... I didn't know why, and then I opened the class WeChat group and asked about other people.

outcome

Bad news!

Or...

Wait?

Let the time brew a little longer, if it really doesn't work...

Liang Xuchao glanced at the content on the screen that he couldn't understand at all, and sighed.

It can only be it!

......