The First Lackey Under The Empress

"Sound waves? Light waves?"

Inside the room, the priests who were listening attentively fell into a brief daze.

One of the priests asked in confusion, "Lord Envoy speaks of water waves, which we all understand, but does sound also have waves?"

Zhao Du'an smiled slightly and said decisively:

"Of course. In fact, water waves and sound waves are the same."

He then picked up the pen in his hand and knocked it on the bookshelf next to him, making a "bang" sound:

"You see, how does sound appear? It is when the pen collides with the bookshelf, causing vibration, which then produces sound. And when you throw a stone into a pool, doesn't the surface of the water also vibrate and make a sound?"

In a world severely lacking in relevant concepts,

Zhao Du'an had to abandon rigor and pursue easy understanding when explaining things.

Sure enough, as soon as he said this, the priests inside and outside the room suddenly understood and felt it made perfect sense.

Gongshu Tianyuan nodded vigorously and said seriously:

"Lord Envoy is right. It's like if the drum surface is covered with dust, when we beat the drum heavily, the dust on the drum skin will vibrate like water waves."

After a pause, he frowned:

"However, does this sound need a medium to transmit from one place to another?"

"Hehe, Brother Gongshu is observant and uses vivid metaphors," Zhao Du'an first praised, and then said:

"Of course it needs one. Well, let me give you an example. Last time I led the soldiers to capture wanted warlocks.

Well, at that time, Priest Jin Jian was also there. The opponent believed in the Wind God. During the fight, he extracted the air around me, causing me to suffocate.

At that time, I called for help from Priest Jin Jian, but found that we couldn't hear each other's voices."

Outside the room.

A priest excitedly echoed:

"That's right, there is indeed such a spell. I have encountered it before, and couldn't make a sound at all. But I don't know why."

"So, could it be that the 'medium' needed for the spread of sound is air? If the air is drawn out, the sound cannot be transmitted."

The crowd discussed animatedly. Most of the priests here were not from the Artisan God sect.

But that didn't stop them from listening to the excitement and participating in the discussion.

Zhao Du'an smiled and nodded:

"You are all right. Similarly, the reason why water waves can exist is because water itself is the medium for those waves."

The short, fat youth Gongshu Tianyuan frowned:

"Lord Envoy is right, but what about light waves? Even if the air is drawn out, we can still see each other, which means light does not rely on air to spread. What does it rely on?"

Crap... I seem to have misspoke. Does the propagation of light require a medium? It seems it doesn't need one at all...

Well, unless I bring out the concept of so-called "ether"... Alas, there's no way, I haven't used this knowledge for so many years, and I've already returned it to my teacher after starting work...

Zhao Du'an choked, realizing that he seemed to have said something wrong.

However, Lord Zhao was a veteran, and although he felt guilty, he remained calm on the surface.

He even showed an admiring expression, sighing:

"Brother Gongshu is indeed a disciple of the Celestial Master. With just a casual question, he hits the key point!"

Gongshu Tianyuan couldn't help but stick out his chest, feeling honored.

Zhao Du'an cleared his throat and said solemnly:

"To explain this clearly, we must first understand what light is and what light waves are. In my opinion, everything in the world is composed of a basic particle, just like a stone that, when crushed, is found to be made of grains of dust...

Water is like this, and so is light... because it is composed of particles.

And these particles are disturbed by external forces at all times, just like dust moving with the wind. The particles affect and connect with each other, and then become light waves..."

Zhao Du'an felt a little guilty when he said this.

Because according to the concept of wave-particle duality that he remembered, light itself is both a particle and a probability wave...

But this thing is too abstract and involves the concept of "field"... His major is not in this area, and he only has a superficial understanding.

So after hesitating, he decided to explain it in a way that was easier to understand...

Anyway, if he said it too abstractly, these people wouldn't understand it at all.

And it's too advanced and completely unnecessary.

...

Inside the small courtyard.

Xu Zhenguan looked strangely at Zhao Du'an, who was talking eloquently on the water screen.

She couldn't help but turn her head to look at the Old Celestial Master:

"Is everything in the world really made of 'dust'?"

Zhang Yan fell silent for a moment, noncommittal.

He just said vaguely:

"Hehe, how can mortals fathom the mysteries of heaven and earth? However, what this person says is not without an interesting hypothesis."

The Old Celestial Master seemed calm, but in reality, he was equally confused.

According to Taoist doctrines, heaven and earth are composed of yin and yang, and the five elements... but Zhao Du'an went a step further and broke down the qi and the five elements into particles...

If someone else had said this, Zhang Yan would have just smiled it off.

After all, there is no shortage of madmen in the world.

But the person who said it was Zhao Du'an, who could utter extremely insightful opinions... the Old Celestial Master was a little unsure.

"Let's see how he continues," Zhang Yan said.

Xu Zhenguan nodded and turned her gaze back to the water screen.

...

Inside the room.

Zhao Du'an cleared his throat and smiled:

"Now that we've talked about what light looks like, it's time to talk about how light travels in a medium. Unfortunately, I can't give an answer to this question either, and I'm still exploring it."

As soon as he said this, many priests became restless and discussed.

However, Gongshu Tianyuan's beady eyes became brighter.

He sternly reprimanded the discussions and said solemnly:

"We cultivate the Tao, and there are countless mysteries that we do not know. How can there be reason to understand everything? Lord Envoy is like this, which is the demeanor that a seeker of the Tao should have!"

A group of priests suddenly felt ashamed and looked at Zhao Du'an with increasing respect.

Gongshu Tianyuan's fat face was filled with excitement:

"Lord Envoy, don't pay attention to them, please continue! Speak quickly!"

He realized that the principle of refraction that had troubled him for several days was coming up next.

Zhao Du'an smiled and nodded, and said:

"Now that we've made the above clear, we should know that the space filled with air everywhere and the suffocating underwater are two different mediums. How many of you have been fishing by the river?"

Fishing?

Immediately, many priests spoke, saying that they had experience.

Zhao Du'an stood with his hands behind his back and said:

"Experienced fishermen will know that when we stand in the stream, holding sharpened wooden sticks and stabbing at the fish swimming in the water, we must not aim directly, but should aim lower to hit it. Why do you think this is?"

"This..."

The priests looked at each other, and one person's eyes lit up:

"Could it be that because the mediums are different, the image reflected by the light is misaligned?"

"That's right!" Zhao Du'an praised, "That's the principle."

He gave a series of explanations with diagrams on the small whiteboard, and then said:

"This principle is actually very familiar to everyone. When you are tired from staying up late and yawning, do you tear up? What happens at this time?"

Gongshu Tianyuan suddenly slammed the table, stood up excitedly, and said:

"Clear! Seeing distant things becomes clearer! I understand! The tears covering the eyes are like light entering the stream, and the image I see is like the fish in the water..."

At this moment, the descendant of the Artisan God was excited.

His brain was running fast.

He felt that the problem that had troubled him for three days and three nights was suddenly solved, and he murmured:

"So, grinding mirrors with crystal is equivalent to placing a special piece of water in front of people's eyes at all times... by calculating and adjusting the light beam reflection..."

"Wait, then why are human eyes like this? Could it be that human eyes are also like a pool of water, just as legs and feet will be deformed when injured, human eyes will also be deformed... This is why vision is unclear..."

"Haha, I understand! I understand!"

At this moment, Gongshu Tianyuan kept whispering to himself.

Staying up for several days in a row, frantically squeezing his brain cells, had already made him emotionally unstable and mentally dazed.

At this moment, he suddenly broke through the shackles and almost danced with joy.

Causing the other priests to look sideways.

"Senior Brother Gongshu is crazy again. The last time this happened was several years ago..."

"What exactly does Senior Brother understand? Why do I still not quite understand?"

"Where did this Zhao Du'an learn his skills? He actually made Senior Brother like this in a few words..."

The crowd was talking.

Zhao Du'an was also very surprised because this fatty's comprehension was a bit amazing.

After all, he had forgotten these knowledge, and only remembered the general principles of lenses.

Therefore, he mostly talked about conceptual things.

And he was not sure if he was saying it right.

But a real genius does not need to be taught carefully.

Just give him a direction, give him a little inspiration, and he will fill in everything himself.

Gongshu Tianyuan, who inherited the Artisan God's legacy, was certainly a peerless genius.

It's just that science is severely suppressed in this era.

And at this moment, Zhao Du'an's simple conceptual words were like a cloud of fog to other priests.

But for Gongshu Tianyuan, it was like a sharp axe, splitting the heavy fog in front of him.

Just like an ephemera seeing the blue sky.

"Brother Zhao!"

Gongshu Tianyuan restrained his smile.

He strode forward, grabbed his hands with force, shook them sincerely, and his fat face was full of red light:

"Listening to your words is better than countless words from my master!

This is the direction I have been searching for. The town objects I made before mostly relied on magical means, but what Brother Zhao said today has nothing to do with magic, but it is the true meaning of the Artisan God."

"... Brother Gongshu is too polite. What kind of person is the Celestial Master? I'm just speculating wildly on weekdays, and I've read some scattered miscellaneous books. It's not credible, hehe, it's not credible..."

Zhao Du'an smiled stiffly and tried to pull his hand back.

He only casually said a few words, and the effect was far beyond expectations.

Gongshu Tianyuan also knew that he had said something excited and lost his words, so he quickly made up for it, and then said:

"In short, what Brother Zhao said today is thought-provoking. If you need my help in the future, you can come to me. Oh, do you lack town objects? For example, this paper skirt can be used for the women in your family..."

"... No need!"

Zhao Du'an glanced at the pile of bizarre magical instruments with strange functions on the shelf, shook his head and refused righteously.

"Okay, well, I've delayed you for a long time. Don't make His Majesty unhappy. Brother Zhao, go and get busy. I still have to digest what you taught me today."

Gongshu Tianyuan looked regretful.

There was a kind of loss that his treasures were not appreciated.

"In that case, I'll take my leave first," Zhao Du'an said with a smile.

For him, gaining this connection was the biggest gain.

...

Shortly after.

Zhao Du'an hurried back to the hall where the palace guards gathered.

He saw the Empress in a light gauze Taoist robe slowly walking out of the three doors, and the attendants stood up to greet her.

"Your Majesty? Have you finished talking with the Celestial Master?" Zhao Du'an was stunned.

Xu Zhenguan nodded lightly, staring at him with extremely complicated eyes.

She wanted to say something, but in the end, she didn't open her mouth, and walked out, lightly leaving a sentence:

"Return to the palace."

...

Typos help catch insects