Wang Xin looked at her bill, her eyelids twitching.
"What did this kid buy that cost me so much money?"
Even if Xu Kai is a scholar of the holy way, he really can't imagine what can cost him so much money.
This figure is also a big expense for him, and it is even a huge bill for Xu Kai.
"No, I have to go see what this kid is spending so much money on."
After saying that, Wang Xin stood up, glanced outside, quickly locked Xu Kai's position, and stepped out.
Arrives in an instant.
…
…
Resisting the urge to hit people, Xu Kai came to the Mo family.
He deliberately avoided Yun Qingshan and came to Mo Cen's workshop.
"Although I don't know what you want these things for, I still prepared them for you."
Xu Kai asked him to make three mirrors. A precise octagonal prism, a rotating plane mirror and a concave mirror are made of glass fired by Yun Qingshan; in addition, an air extraction device with a wind-fixing stone as the core is also required, a most accurate Clocks and the most accurate ruler, as well as a laser emitter with red rutile as the core. Of course, Mo Cen called that thing a light emitter. After all, there is no concept of laser in this world.
He wants to measure the speed of light.
To be honest, these things are not complicated, and it is a waste of the Mohist's profound mechanical skills. But for Xu Kai, what he needs is precision, which is far beyond the ability of ordinary craftsmen, so the price is very high. And in order to ensure that the measured vacuum light speed is accurate enough, he specially used expensive wind-fixing stones to ensure the best air extraction effect.
So Wang Xin was a little surprised when he saw the bill.
Most problems in the classical physics system can be verified in daily life, but the speed of light is what he must measure. Because this involves the issue of whether the subsequent theory of relativity and quantum physics can be directly used.
If the speed of light in the two worlds is different, he may really want to pave the way and try to become the Einstein of this world.
Xu Kai carefully inspected these instruments and invited a holy lecturer to help him check whether these instruments met the accuracy he required and whether they were bombs.
After confirming that Mo Cen had not cut corners and that the props would not explode, Xu Kai found a large open space with these experimental equipment and began to prepare for the experiment.
Mo Cen followed Xu Kai all the way and helped him move those things.
The sun shines on this open space, making this place particularly dazzling. Xu Kai looked up at the sun in the sky and smiled. This nice weather was just what he needed.
"What are you doing?" A voice suddenly sounded in the venue.
Xu Kai and Mo Cen looked at the source of the sound and found that it was Yun Qingshan.
"How did you find this place?" Xu Kai thought he had avoided Yun Qingshan as much as possible.
"If you are here, I can find you." Yun Qingshan approached with a smile and glanced at the device Xu Kai was placing. Xu Kai quickly protected these experimental props. These items required extremely high precision and were therefore particularly fragile. If it is accidentally touched by someone, it is likely to affect the results of the subsequent experiments.
"I won't touch these things." Yun Qingshan shook his head, "So what are you doing?"
Xu Kai thought for a while and felt that there was no need to hide such a thing, so he said directly: "I plan to measure the speed of light."
"Measuring the speed of light?" Mo Cen called out first, "What is the purpose of measuring the speed of light? What's the use?"
"I don't see any use in the short term, but it will be of great use in the future." Xu Kai continued to debug the equipment while talking, "I have read the notes of a semi-saint. When he was traveling in the starry sky, he was surprised to find that the light of the stars was not It takes a certain amount of time to reach Tianyan Continent in an instant. Since it is not instantaneous, it must have speed. I am quite curious about this and plan to give it a try."
This is one of Xu Kai's gains from staying in the bookstore these two days. Otherwise, if the speed of light in this world is action at a distance, what else is there to measure? Although the half-saint discovered that light also has speed, he did not measure the speed of light. Later, no one else did any work related to it.
Because it is of no use.
Mo Cen frowned. Even if he used his best imagination, he could not imagine the use of measuring the speed of light. Calculating the distance between stars and Tianyan Continent? But what's the use?
"Don't always think about the meaning of these, Mo Cen." After roughly placing the experimental equipment, Xu Kai said, "It doesn't matter what the purpose is. What is important is to explore unknown ideas and moods."
Mo Cen frowned and retorted: "Learning is for the purpose of running the country and benefiting the people. This is the thought of Confucianism, the same is true for the mechanism skills of our Mohist school, and the same is true for the numerology methods of the Qin Shushuists. However, you waste a lot of money without knowing it." I don’t know if your measurement of the speed of light is in line with Master Zhang Sheng’s sentence of ‘Establishing a heart for the heaven and earth, establishing a destiny for the people, carrying on the unique knowledge for the saints, and creating peace for all generations’?”
This Lord Zhang Sheng refers to Zhang Zai.
Hearing this, Xu Kai stopped the final adjustments, glanced at Mo Cen, then sighed helplessly and said, "This move may bring peace to all generations."
Mo Cen's frown deepened, and he wanted to say something, but seeing that Xu Kai didn't seem to have the intention to continue, he didn't speak.
Yun Qingshan watched with interest as Xu Kai continued to debug the equipment. Finally, everything was over, and Xu Kai started to start the equipment and evacuate the air under the hood.
"Why do you need a wind-fixing stone?" Yun Qingshan asked.
"The Semi-Saint's Notes wrote that the speed of light propagating in the starry sky seems to be different from the speed of light propagating in Tianyan Continent. I suspect that the air in Tianyan Continent affects the propagation speed of light. In order to measure it accurately enough value, the air must be extracted.”
Hearing this, Mo Cen, who had originally planned to stop talking, couldn't help but ask: "Even if this is true, can't you just measure the speed of air? Only a half-saint can travel in the starry sky. For most of the lives in Tianyan Continent, Said, the stars are all out of reach. Even if the speed of light you measured is really useful, why would you measure the speed of light in a starry sky without air?"
Xu Kai ignored him this time, but was thinking to himself, wondering if Faraday's mood was similar to his own when he was questioned like this?
Perhaps being a numerologist is not his final destination. What I have to do is to establish my own system, spread science, and break Tianyan Continent’s disdain for “meaningless” issues.
Although he is a scholar of the holy way, he is still too weak. A man speaks softly, and even if he goes to promote scientific concepts, without the evidence of facts or the guarantee of his own strong strength, no matter how much he does, it will be of no avail.
Xu Kai set up a mirror. This is Michelson's method of measuring the speed of light, which was derived from Fizeau's method. Fizeau's method is simply to emit light from an initial point, pass through a gear, and then be reflected by a mirror to the observer's location. Then the gear is turned. When the observer cannot observe the light at all, the light can be reflected through the gear. The speed is then used to calculate the speed of light. However, due to the width of the teeth of the gear itself, the measurement is not accurate enough. Michelson improved this method and replaced the gear with a more precise octagonal prism, thus obtaining an extremely precise number: 299796km/s. This value is very close to the number 299792.458km/s commonly used in modern times.
Xu Kai's advantage is that although there are no industrial facilities in Tianyan Continent, the accuracy that the Mohists can achieve far exceeds the accuracy that Michelson can achieve. Moreover, after being strengthened by his literary temperament, his observation ability is far beyond that of humans in previous lives. . Therefore, Xu Kai believed that at least he could measure the speed of light accurately to single digits.
It is worth mentioning that Tianyan Continent also uses meters, seconds, minutes and other units for length and time. Xu Kai didn't know what caused the units in the two worlds to be so similar. Maybe there were some secrets in it.
The air extraction device made by Mo Cen was activated, and the Dingfeng Stone showed its power. Soon, the device made a slight clicking sound, indicating that the air had been extracted.
Xu Kai came to the observation point set up and signaled Mo Cen to help him activate the laser, but Yun Qingshan stepped forward and activated it before Mo Cen.
"What are you doing?" Mo Cen was confused.
Yun Qingshan smiled and said: "Let me do it."
After obtaining the data, Xu Kai began to calculate. Yun Qingshan's operation was correct, so it did not hinder the accuracy, and he did not care too much.
The calculation is completed, and the speed of light in Tianyan Continent is——
"Two hundred and eighty-one thousand three hundred and seventy-four kilometers per second?! How is it possible? How could it be wrong... How could it be this number?!" Xu Kai actually shouted in horror, his face turned pale with shock, If it is an error in single digits, that's it, but even the numbers in tens of thousands are such a big difference, there is no way this error can be explained by a sentence!
Is the underlying logic of this world really different, but they are just similar within the scope of classical physics? !
Mo Cen asked doubtfully: "Is there anything wrong with this number?"
Xu Kai said nothing, just frowned and thought about the flaws in the experiment he designed. Then, he made some adjustments and asked Yun Qingshan to fire a laser beam again, calculated again, and obtained a new result.
"Two hundred and eighty-one thousand three hundred and eighty-three kilometers per second?"
Xu Kai looked up at the sky, and in a daze, he seemed to feel that he saw many stars. Those stars kept flashing, seeming to indicate some kind of reminder. However, Xu Kai couldn't understand it at all.
Xu Kai paced back and forth, his face gloomy and uneasy. Then he continued to measure, and the final results always started with 280,000.
"Is it really different?" Xu Kai sat directly on the ground and murmured to himself.
"What's different?" Another voice sounded. Xu Kai turned around and saw that it was Wang Xin coming over. The three of them saluted Wang Xin.
"What are you doing?" Wang Xin looked around and saw a series of devices set up by Xu Kai, frowning and asked.
Mo Cen spoke first: "Sir, Xu Kai said he was measuring the speed of light."
"Measuring the speed of light? What's the point of this?" Wang Xin's brows furrowed deeper.
"Sir, although I have measured the speed of light, I always feel that something is different." Xu Kai did not say any more about the significance of measuring the speed of light, but simply expressed his confusion directly.
Wang Xin glanced at him and felt that the other person seemed to have something to say, but in the end he suppressed it. He didn't know what the other party wanted to say, so he walked forward and carefully observed the device designed by Xu Kai, especially the Wind-fixing Stone and the Red Core Stone. These two items are probably the most precious things in this set of devices. The wind-fixing stone can control the wind, whether it is rising or steadying the wind; and the red core stone contains great energy, but this energy is extremely It is stable and will not cause accidents such as explosions. These two things are very precious, and even if a Jinshi goes bankrupt, he may not be able to purchase one of them.
It was probably these two things that cost him a lot of money.
Wang Xin thought for a while and then asked: "You plan to measure the speed of light in the starry sky, but you can't travel in the starry sky, so you want to simulate the empty environment of the starry sky on the ground?"
"That's right." Xu Kai was a little surprised that the other party actually saw what he was going to do without any knowledge of modern science. "I think the values measured in the starry sky environment are meaningful."
"Then why haven't you emptied the air of heaven and earth?" Wang Xin asked doubtfully.
"ah?"
"Ah, what, the starry sky does not have the energy of heaven and earth, so at least a semi-saint can travel in the starry sky. How can you get the speed of light in the starry sky by measuring it like this?"
"The energy of heaven and earth?!" Xu Kai suddenly stood up, "Will the energy of heaven and earth interfere with the transmission of light?!"
"Yeah, what are you thinking about?" Wang Xin's expression became even more confused, "I thought you thought that the Kongming Stone, which allows you to drain the energy of this large area of heaven and earth, was too expensive, so you planned to make it yourself to save money. Here’s some money.”
"The energy of heaven and earth, the energy of heaven and earth, the energy of heaven and earth..." Xu Kai paced back and forth, seemingly thinking about something. Then, he made a big salute to Wang Xin: "Please help me, sir, to drain the energy of heaven and earth from here!"
"Such a small thing doesn't need to be like this. You can do it if you spend some time." Wang Xin waved his hand, and the energy of heaven and earth surged, forming a huge vortex in Xu Kai's device, causing the energy of heaven and earth to flow here. Nothing exists in a space.
The green grass that was growing vigorously on the ground suddenly withered away because it lost the energy of heaven and earth, and looked like it was about to wither.
"Start measuring!"
Yun Qingshan immediately activated the laser transmitter again. After getting the data, Xu Kai, excited, immediately started calculating.
"Two hundred and ninety-nine thousand, seven hundred and ninety-two kilometers per second! That's the number!" Xu Kai shouted excitedly. Although he couldn't be accurate to three decimal places due to limited conditions, the two worlds were moving at low speeds. The physical rules in the macroscopic field are exactly the same, and the measured speed of light is so close, and there is a high probability that it is the same, which shows that the theory of relativity and quantum physics are also feasible in this world!
The holy road never ends!
Seeing Xu Kai's excited expression, Yun Qingshan just smiled, but Wang Xin and Mo Cen frowned deeply.
"Could it be that you blew him up last time?" Mo Cen reflected for the first time on whether the bomb he made was bad.
