Set up an experimental bench, get a light source, place a prism, and place a white cardboard on the other side of the prism for a classic dispersion experiment. Then, add a thermometer to the left and right ends of the seven-color light area, squat down to the side and start scratching your chin:
How to prove ultraviolet light?
The proof of infrared rays is very simple. Outside the red light area, the temperature of the thermometer rises extremely high, which can prove the existence of infrared rays. But what to do with ultraviolet rays? Thermometers in the ultraviolet light area do not heat up...
Silver bromide seems to be sensitive to ultraviolet rays, which can be proven by sensitizing silver bromide negatives... But where can I find silver bromide? Is bromine pure in this world?
"Auro! Auro!" Grete shouted. The towerling SS passed his shout down layer by layer, and soon Aurora ran up:
"Gretel, what's the matter?"
"What progress has the Parliament made on elemental elements recently?" Grete asked a series of questions: "Have you found a reddish-brown elemental element with a foul smell?"
"I haven't heard of it..." Aurora was stunned, searched her memory, and shook her head in confusion. Seeing Gretel's disappointed look, he immediately raised his hand and said:
"I'm going to read the paper! I'm going to read it! This is about the Change School next door, which is a bit far away from our Plasticity School. You have to give me time to check it out!"
Aurora ran down with a clang. Gretel put his hand on his forehead and sighed helplessly:
It seems a bit wasteful to let a sixth-level mage do this kind of work? Sure enough, we should recruit a few more apprentices... At least flipping through journals, checking papers, searching for information in the parliament database, etc., can be left to the apprentices...
Sighing, the ultraviolet rays still have to be proven first. Grete clasped his hands behind his back, bent over, walked around on the ground several times, and started pulling his hair again:
How to prove it? The sterilizing effect of ultraviolet light? This is what he is best at, but if he has to put his face on the microscope to verify the bacteria cultured by the teacher, he is afraid that the Lord of Thunder will kill him;
How about measuring the wavelength of ultraviolet light? The question is...how to measure the wavelength of light? He is a medical student, he is not a physics major!
Or, find another substance that is sensitive to ultraviolet rays, even if it is an animal... By the way, undead! Undead!
It is said that undead creatures, such as vampires, are afraid of sunlight. The main reason is that they are easily harmed by ultraviolet rays in the sun! As long as he can prove that undead creatures are sensitive to light outside the purple light area decomposed by prisms, it will prove the existence of ultraviolet rays.
!
emmm…
Grete rushed down. He rushed to the laboratory next to the negative energy room on the second underground floor of the mage tower, and stretched out his palm to Master Lin En as a matter of course:
"Brother Lin En! Do you have any undead creatures here? Some are relatively weak, some are particularly weak. They will fall when the sun shines on them. Can you give me an experiment?"
Linn raised her eyebrows at him in surprise.
A moment later, Gretel returned with satisfaction, carrying the new necromancer in the tower, classmate Leon Carlos, and a bag of bone fragments and finger bones that he had processed and prepared as replacement materials for the skeleton soldiers...
The experiment was a great success!
After the white light was decomposed by the prism, in the dark area outside the purple light area, the undead bone fragments reacted with invisible light waves!
Grete was greatly inspired. He imitated the idea of using a thermometer to measure infrared rays and asked Carlos to put down a long bone (it looked like a rib) that was long enough and evenly impregnated with necromantic energy. Then, he held the watch and observed the various parts of the bone.
Variety……
Facts have proved that the area illuminated by infrared and red light suffers the greatest damage (Gretel guessed that this is the same principle as the undead beings afraid of fire), and the degree of damage decreases in order towards the rear parts.
Then, in the ultraviolet area, there was another sudden jump in the extent of the damage to the skull's ribs!
This evidence is enough to prove that there are high-energy rays in the ultraviolet region!
Not bad, not bad, great!
Grete clenched his fist and began to write quickly. Experimental design, experimental equipment, experimental process, experimental results... After writing more than half of it, he stood up and stretched, and Cerela suddenly appeared out of nowhere:
"Gretel, what are you writing?... Prove that there are other lights besides the seven colors of light decomposed by the prism?"
She waved her white fingers in front of the prism, tapping a little in the infrared area and a little in the ultraviolet area. Grete hammered her shoulder with her backhand:
"Yeah, it's so troublesome. Especially for ultraviolet rays, there is no corresponding reagent..."
"What's the proof for this? Can't everyone see it?!"
"??" This is invisible light! Infrared and ultraviolet are all invisible light!
"I can see it!" Cerela insisted. She then hesitated slightly:
"Well... I can't say 'see' it on the red side, but I can feel it; it's very clear on the purple side, it's such a wide purple light band! Then, here!"
The index finger and thumb were spread out, and the width was measured about one hand above the skeleton soldier's ribs. After looking at it, he retracted his index finger, stretched out his middle finger, and tried to increase the width as much as possible.
Gretel:……
Too careless.
Visible light means light that can be seen with the naked eye; there are many animals in this world that can see infrared and ultraviolet rays with the naked eye. As for the problem of communicating with animals... this world is a magical world.
!
And, there is indeed magic that allows people to see infrared rays directly!
Grete raised his hand and applied [Dark Vision] on himself. Sure enough, in the infrared area, just like the last time he checked whether there was any leakage in the laboratory, he saw a faint image, but it must not be ignored!
Grete continued to record: "Experiments have proven that [dark vision] can allow people to see images in this area... It can be seen that the principle of [dark vision] is that people can see infrared rays with the naked eye..."
Then, Gretel inhaled and exhaled, and summoned the totem snake spirit of the contract. Very good, snakes can see ultraviolet light, and the magician can also see the ultraviolet area through the eyes of the contracted object, although the picture he sees is rather strange.
In this way, the evidence is very rich and can be handed over to the teacher!
Grete wrote seven or eight pages eloquently, and early the next morning, he went to the Tower of Babel with his thesis to ask for an audience. The Lord of Thunder read the paper at a glance, and his expression was neither happy nor angry, and was unfathomable. The speed of this kid's experiments and the paper
The speed is indeed fast enough, and what I write is substantial enough, but...
"What about frequency?"
"What?"
"What are the frequencies of these two types of light? Didn't you say yesterday that the frequency of infrared rays is lower than red light, and the frequency of ultraviolet rays is higher than that of blue-violet light? What about the frequencies?"
"...I don't know how to test..."
The Lord of Thunder inhaled, exhaled, inhaled again, and exhaled again. With a flick of his finger, a walnut bookcase next to him automatically opened the door. Two thick stacks of books, journals, and papers flew out, one to the left and one to the right.
On the table in front of Gretel.
There were two "pop" and "pop" sounds, which made Gretel jump twice in shock. He strongly suspected that if he hadn't dodged quickly, these things would have hit him on the head...
"Let's take a look." The Lord of Thunder raised his chin slightly. Gretel carefully picked up the book on the left and glanced at the cover:
"On Light"
This topic is so big... He turned one page, then another, and soon he began to feel dizzy:
"...Each surface element on the wave front can be regarded as the secondary agitation center that generates the spherical wavelet, and the position of the wave front at any time in the future is the envelope surface of this wavelet..."
Grete put it down silently and looked at the next paper. Very good, this topic is a little smaller, "A Little Study on the Diffraction of Light":
"The vibration of a point in front of the wave front is the superposition of wavelets emitted by the elements above the wave front at that point..."
I checked my eyes and found that it was a text that I couldn't understand at all...
Gretel calmed down and looked at the third and fourth copies. After flipping through a thick stack of papers, he only confirmed one thing:
In the magic world, there are a large number of magicians who believe that light is a wave.
OK, so there are papers supporting the particle theory on the other side? Grete lay on the other side and flipped through it. Sure enough, in four or five consecutive papers, he saw the familiar "ether".
Very good, very good, particle theory and wave theory have lived up to expectations, and they are also fighting here!
Gretel put down the paper. He took a deep breath, looked directly at the Lord of Thunder, and said calmly:
"I don't want to study this."
"Um?"
"My interest is not here." Let's talk about waves, and let's talk about particles. In three hundred years, they have been rolling around and pinching each other. The end will be the development of wave-particle duality.
The problem is that you have not even finished measuring the elements. You have not observed protons, neutrons and electrons. It is even more impossible to discover the photoelectric effect. Take the wave-particle duality first!
I don’t want to jump into the big pit of theoretical physics!
"If you don't do research, the honor in the future will not belong to you." The Lord of Thunder said solemnly. What a pity. Just discovering infrared light and ultraviolet light is nothing. If their properties can be analyzed, this paper,
You can definitely play "Arcane"!
He secretly regretted that Gretel shook his head quickly, as if he didn't want to get involved even if he died. The Lord of Thunder did not force his head to be pressed, and immediately proposed an alternative plan:
"Then, can I find someone to complete this part and count him as the joint first author?"
Fortunately, he had already thought of this, and even had three candidates in his mind. Although it was a pity to share the honor, measuring the wavelength of light is not that easy.
Magical strength, laboratory, experimental equipment, meeting all the conditions, at least a high-level mage can do it.
Taking into account the strength comparison between the two sides, the position of the joint author must be given no matter what.
Fortunately, little Gretel doesn't value research honors that much...
However, Gretel hesitated and remained silent. The Lord of Thunder narrowed his eyes slightly:
"how?"
"How long will it take to test this...I'm waiting for the paper to be published so that I can recruit apprentices!"
"……roll!"
Grete turned around and ran away.
****
Your enthusiasm for infrared and ultraviolet light verification methods is really beyond my expectation...
In the chapter last night, most of the book reviews were about proof methods (dumb), which reminded me of your enthusiasm when asking how to convert alternating current to direct current...
Routinely asking for subscriptions, monthly tickets, recommendation votes, book reviews...all kinds of...