Lin Qianyu felt her familiar light breath lingering on the tip of her nose, and instantly understood that this was Zheng Feng, she buried her head deep in Zheng Feng's arms, and the hands that wanted to hold Zheng Feng could only hang down because they were carrying things:

"Feng, why are you here? Why did you hug me all of a sudden? Did something happen? ”

Zheng Feng felt Lin Qianyu's warm face, and replied with a smile:

"No, so we met because we had a soul, and I missed you too much, so I came to hug you, what, do you hate it?"

Hearing Zheng Feng's somewhat lost voice, Lin Qianyu hurriedly raised his head and looked up into his eyes and said:

"No, I don't hate it, if you ...... If you want to hug me in the future, you can do it whenever you want! ”

After speaking, Lin Qianyu shook the shopping bag in his left hand and said softly:

"Zheng Feng, I still have an exam today, so I went to the fast food restaurant recommended by my classmates and picked up two copies, let's eat together, shall we?"

"Good! As long as you eat it with me, it will be the most delicious food in the world. ”

Zheng Feng said as he took the items in Lin Qianyu's hands, Lin Qianyu originally wanted to mention one of them, but Zheng Feng insisted that she happily accepted Zheng Feng's help, after all, this is Zheng Feng's performance of caring and caring for her, and Lin Qianyu was too late to be happy.

When Wei Yueying walked out of this secluded road with Zheng Feng's arm, she saw a motorcycle colliding with a sedan, and the motorcycle had been broken into two sections from the middle.

"Huh? Isn't that just getting to that motorcycle? How can this be, it's dangerous. ”

Zheng Feng squinted at the two people wearing cracked helmets who were paralyzed on the ground and did not move, smiled lightly, and then immediately regained a serious expression and said to Lin Qianyu:

"Yes, Qianyu, you have to take care of yourself in the future, don't be so reckless as them! Got it? ”

Lin Qianyu looked over there and nodded, originally wanted to say something, and then was taken away by Zheng Feng, the two talked and laughed along the way to the Huxin Pavilion that Lin Qianyu said, this lake is one of the springs in the campus of Xia University, the crystal clear lake water and the small forest around the lake specially designed by the horticulturist of Xia University make this a good scene on campus, Lin Qianyu pulled Zheng Feng to the Huxin Pavilion and sat down, fortunately, because of today's exam, except for students like Lin Qianyu and Ye Chen who have been prepared, Very few people are in the mood to come here at noon, so this also makes it possible for no one to disturb them.

After the two finished lunch, Lin Qianyu talked to Zheng Feng about today's exam, the time was about two o'clock, and the afternoon exam started at half past three, Lin Qianyu, who had always had the habit of napping, couldn't help but be a little sleepy, Zheng Feng immediately noticed Lin Qianyu's sleepiness, he patted his shoulder, and said:

"Qianyu, come and rest, a man's shoulder is a resting place for his beloved lady!"

Lin Qianyu suddenly blushed, although she lived with Zheng Feng, and often held hands and hugged, but lying on Zheng Feng's body to rest was still a little nervous for Lin Qianyu, Zheng Feng looked at Lin Qianyu's red face, and then looked at his shoulder height and Lin Qianyu's size, then leaned sideways and directly hugged Lin Qianyu's shoulders and leaned her body in his arms, and then stroked Lin Qianyu's hair and said softly:

"Okay, take a break, shall we? I'll call you. ”

Lin Qianyu nodded in a daze, and gradually fell asleep with a sweet smile on Zheng Feng's chest......

In the dormitory not far away, Ye Chen hasn't slept yet, his current mental state is enough for him to stay awake in the afternoon without taking a nap, the content of the afternoon exam is the three elective courses Ye Chen selected in high school, Ye Chen's grasp of these three subjects is still guaranteed, but Ye Chen also understands the truth that "pride makes people backward, modesty makes people progress", and he did not relax at noon and was still working hard to prepare for the exam, until three o'clock in the afternoon Ye Chen was immersed in the books, until the preset bell rang, he raised his head and glanced at the empty dormitory.

"Wang Guodong estimates that he will go to the library to read books, as for Yang Fanjie, he may go to spend all his time drinking, forget it, I don't need to care, prepare for the exam!"

After that, Ye Chen looked in the mirror and sorted out his clothes, then went out confidently with his handbag, along the way Ye Chen met many listless classmates numbly walking in the same direction as him, Ye Chen shook his head disapprovingly, and walked quickly to the examination room.

It is still the same examination process as the morning exam, the examiner has not changed but has been replaced by an equally old deputy examiner, but Ye Chen did not care about these details, and devoted himself to the examination process, the multiple-choice questions of physics and chemistry and politics are naturally not a problem, Ye Chen quickly completed it under the condition of ensuring the highest accuracy, and then Ye Chen began to overcome the calculation problems of physics and chemistry:

"First, in Young's experiment, the distance between the two seams is 0.2mm, the distance between the screen and the slit is 1m, and the third bright stripe is 7.5mm away from the central bright stripe, and the wavelength of the light wave is found?"

As soon as it came up, there were a few classic old questions, and Ye Chen, who had prepared in advance, naturally did not have a problem, and wrote the answer in a mellow font:

"Solution: When the optical path difference of the light waves emitted by S1 and S2 dsinθ≈d(x/D)=± kλ k=0,1,2......

x=± kD/d·λ，k=0，1，2……

The interference between the two light waves on the screen is strengthened, and the light intensity is extremely large, and bright streaks appear.

Knowing d=0.2mm, D=1m, k=3, x=7.5mm, then λ= xd /(kD)

λ=7.5×0.2/(3×1×103) mm=500nm”

After completing the question, Ye Chen quickly thought about the next question, but the two professors who were drinking red dates and wolfberry tea at the lectern kept looking at Ye Chen, and one of the professors said:

"Old Tan, is he the potential student you said? Well, it's good to look at, don't panic, I just don't know how my strength is. ”

Professor Tan took a sip of tea with a smile, glanced at Ye Chen, and replied:

"Aren't you going to see it with your own eyes? Isn't there a shortage of people in our mechanical physics special education class! If he meets our requirements, he can think about it. ”

The old professor on the side nodded and complained:

"Alas, the leaders of the school have transferred us to the front line of education again! I'm afraid I'm going to tear down my old bones. ”

After that, he slowly stepped on the steps and walked slowly to Ye Chen's side, and looked at whether the thinking questions he deliberately made according to the freshman level could be made by this Ye Chen, and it was a coincidence that Ye Chen happened to do that question:

"In Young's experiment, if the distance from the light source S to the two slits S1 and S2 is unequal, such as SS1 >SS(2), what is the effect on the experimental results?"

Ye Chen looked at this question, and stopped writing with some doubts, this seems to be a simple formula understanding question, but in fact, it examines his actual cognition and thinking of theorems, it can be said to be a topic with a pit, but this does not mean Ye Chen, although this question is a bit biased for Ye Chen, but fortunately, many of the books Ye Chen reads are knowledge that cannot be accessed by freshmen, and the way of thinking about theorems has been applied Ye Chen still understands.

After some thought, Ye Chen confidently wrote down the answer:

Answer: At this time, S1 and S2 are still coherent light sources, but the initial phase is different, and whether the interference is strengthened or weakened at any point P on the screen AC in Figure 13-2 is not only related to the optical path difference of S1 and S2, but also related to the initial phase of the two.

When SS1-SS(2)=±2K·λ/2 K=1,2,3... , there are still bright stripes at the center O of the screen, and the light and dark stripes at all levels are evenly spaced and symmetrically distributed on both sides of the center point O;

When SS1-SS (2)=±(2K+1)·λ/2 K=0,1,2... , dark stripes appear at the center O of the screen, and the light and dark stripes at all levels are evenly spaced and symmetrically distributed on both sides of the center point O;

When SS1-SS(2) is not equal to an integer multiple of λ/2, the interference fringes between light and dark can still be observed on the screen, but the light and dark fringes at all levels are not symmetrically distributed with respect to the O point. ”

After answering this question, the remaining questions were no longer a threat to Ye Chen, and they were done as if they were sending points, the old professor next to Ye Chen watched Ye Chen finish the question quickly, and Ye Chen didn't notice the old man next to him because he was too focused on the exam, the old professor saw that Ye Chen was about to finish writing the physics test paper, he turned around with a smile and stepped on the steps back to Professor Tan, and as soon as he sat down, he said to Professor Tan:

"This kid has the potential to develop, I think it's good, you can try to get in touch with it, and if there is no problem, you can apply to the above!"

"Yes!"

Professor Tan said with emotion:

"I've seen a child who is very suitable for learning physics before, but because of his parents, he went to finance, and interest is sometimes the basis for making a career, and we have to confirm whether the child likes physics!"

More than an hour passed, a male student took the lead in standing up, but he was wearing an oldened denim suit, and his head was even more flamboyant, he took a figure-eight step without the image of a student and threw the three test paper bags on the table and walked away, both professors frowned, the old professor as the deputy examiner just wanted to stand up and stop him, Professor Tan pulled him, shook his head, and waited for the old professor to sit down angrily, Professor Tan said softly:

"This kind of student is destined to suffer if he can't handle the relationship in the university well, now you can only stop him to disturb other students, it's not worth it, just tell the director of the teaching department in charge of student discipline in a while, don't be angry, Lao Yan, you are going to be a grandfather, you have to change your temper!"

At this time, Ye Chen, who had checked the test papers several times, also stood up, he walked down the steps slowly, and then bowed to the two examiners as in the morning, then put the test paper bag on the table, and by the way, sorted out the exam bag that the student threw just now, and then bowed slightly to the two examiners again and left the examination room.

Both examiners nodded, and Professor Yan said:

"Not arrogant or impatient, and polite, and the personality seems to be good!"

Professor Tan nodded to indicate that he agreed, and then glanced at the name on the test paper bag: Ye Chen.

Ye Chen...... Well, the words are not bad, look back at his grades, and give him a chance to grow! ”

Ye Chen naturally didn't know that his natural movements would arouse the favor of the two professors, and he only had one thought now:

"Finally passed!"