ninja bandits

The circuit is closed, and blue-white current is injected into the silver-white sodium filament, continuously emitting traces of dim yellow light.

The light emitted is concentrated by the mirror around the sodium lamp, passes through the only circular outlet, pierces the darkness, and goes straight to the translucent spectroscope.

As soon as it made contact with the spectroscope, a small half of the beam was reflected by the mirror, turned out at a right angle, and shot straight towards the ice mirror at the twelve o'clock direction.

The remaining half of the light beam undergoes two refractions, passes through the spectroscope, and comes to the back of the spectroscope with exactly the same parameters and a compensation function.

After being weakened by one layer again, the light beam passed through the second beam splitter and came to another ice mirror located at the three o'clock direction.

Hitting the completely opaque ice mirror, the beam immediately made a 180-degree turn and returned along the original path.

It passes through the compensating spectroscope again, arrives at the surface of the original spectroscope, is forced to reflect at a right angle, and merges again with another beam of light coming from the twelve o'clock direction.

Two overlapping beams interfere with each other.

Wave crests and troughs cancel each other out and overlap.

Finally arriving at the black observation screen located on the six o'clock defense line, a row of alternating light and dark interference fringes was projected.

To be more intuitive, the light path of the experiment is roughly as follows:

…………reflector………

…………↑…↓…………

…………↑…↓………Reverse

Light source→→Spectroscope←→Light

…………↓～↓……Mirror

…………↓～↓………

…………observation screen……

Seeing the alternating light and dark strips of light on the observation screen, Kaguya nodded with satisfaction.

He turned to look at the naughty children behind him and asked: "Who is willing to go to the round platform and help me observe the stripes on the black wooden board?"

"I go."

Before anyone else could speak, Terumi Mei jumped up first and landed firmly on the round platform.

"Be careful not to block the path of the light."

Looking at the orange-haired little girl on the round platform, Kaguya instructed: "Then observe whether the light and shade of the stripes on the black wooden board change, and whether there is any movement."

"I see."

"Xiao Ming, stand still, I'm going to start moving."

After another reminder, Kaguya quickly completed the seals with his hands and gently pressed them on the ground.

Thick earth-attribute chakra surged out from the palm of his hand and quickly enveloped the entire round table along the ground, covering it with a 'chocolate' coat.

Immediately afterwards, under the control of Kaguya Xiu, the circular platform with a diameter of more than five meters began to rotate clockwise, faster and faster.

When the disc's rotation speed reaches one revolution in three seconds, it begins to slow down slowly and finally stops completely.

Controlling the circular platform to sink into the ground and fill the courtyard again, Kaguya stood up and asked with a hint of anticipation: "Have you observed any changes?"

Patting her dizzy head, Terumi Mei said softly: "No."

"sure?"

"I am very sure."

After recalling the scene just now, Terumi Mei spoke firmly.

Immediately, his face fell, and he bit his lip and asked, "Brother Xio, did the experiment fail?"

"No, the experiment was very successful." Kaguya Xiu's answer was a bit unexpected.

Terumi Mei and the onlookers:? ? ?

Looking at the little kids with black question marks on their faces, Kaguya Xiu raised the corners of his mouth slightly and explained: "This experiment verifies whether the speed of light is constant in different reference systems.

Since the stripes do not change, it means that the speed of light is indeed constant. "

The crowd was still confused. 'Reference system', 'speed of light', etc. were also unfamiliar terms to them.

Miyin in the field could barely understand: "How did the captain realize this?"

"Well, we assume that there is an absolutely stationary reference frame, and the propagation of the speed of light in this reference frame obeys the principle of velocity superposition...

...According to calculations, the amount of movement of the stripes is about 0.17. "

Knowing that no one could understand it, but in order to share the joy of the success of the experiment, Kaguya still briefly explained the principles of the Michelson-Morley experiment.

"As a result, Xiao Ming did not observe the movement of the stripes, which shows that the speed of light is constant in different reference systems and directions."

He had wanted to do this experiment for a long time.

It's a pity that he went to the battlefield right after graduation, hovering on the edge of life and death, and had no time or energy to build instruments and complete this experiment.

A smile appeared on Terumi Mei's face, with little stars shining in her eyes, and she said sternly without realizing it: "Brother Xio is so awesome!"

"As expected of our dean, he can design such a powerful experiment."

"Yes, Dean Xiu actually knows so much!"

"If only I were as smart as Dean."

After being reminded, some of the more discerning kids in the crowd quickly agreed.

Shaking his head and not accepting the compliments from everyone, Kaguya said sincerely: "I'm just standing on the shoulders of giants."

The really powerful ones are the pioneers like Newton and Einstein. He is just a porter who picks up people's wisdom.

"Dean, what does it mean that the speed of light remains unchanged?" After quieting down, Rikka suddenly asked.

"Answered the question I just asked you in class."

After putting away the experimental equipment on the ground, Kaguya said firmly: "The fastest thing in the world is light!"

Liu Huahua asked thoroughly: "Why?"

"This involves a theory called 'Special Theory of Relativity'. The specific content is relatively complicated. I will explain it to you in detail when you have accumulated enough basic knowledge in the future."

Although he knew that these little ones could not understand the content of the theory of relativity, in order to cultivate everyone's curiosity and broaden their horizons, Kaguya patiently explained:

“This theory holds that in any reference system, the speed of light is constant, and the speed of other objects can only be close to the speed of light, and cannot reach or exceed the speed of light.

Moreover, the same object may have different time, mass, length and other things in different reference systems.

The most important thing is that it tells us that energy and mass can be converted into each other! "

The method of moving through space-time ninjutsu, which is suspected of moving through wormholes, has broken away from the traditional definition of speed.

Therefore, it is not within the scope of his discussion.

"This experiment can reveal so many things?" Terumi Mei was a little unconvinced.

“Truth is often hidden in the most mundane little things.

When you accumulate enough knowledge, you may find great truth in even a very common thing. "

Recalling the stories in the elementary school textbooks of her previous life, Kaguya's lips curled up slightly: "For example, gravity was accidentally discovered by a nobleman who was hit in the head by an apple."

Terumi Mei was curious: "Which noble?"

She knew that gravity existed, but she didn't know who discovered it.

"The Great Heavenly Lord of all principles, Isaac Newton!"

"Strange title, strange name, I've never heard of it." Terumi Mei once again doubted her life.

Seeing this in Yunliwuli, Lin Yuyu was extremely impatient and couldn't help complaining: "Having said so much, what is the use of the conclusions drawn from this broken experiment? Can it make money?"