"Do you remember how the electron microscope works?"

Mo Yu was stunned and nodded, "I remember emitting electron ......"

"That's right, SEM's electron gun generates a high-energy focused electron beam that hits the surface of the sample, and the reflected signal is received and processed into an image." Hu Donghai put his hand on the monitor, and hanging above the black ball was a field firing electron gun, "This is actually the basic principle of all our observation methods, shoot out a beam of light, and then receive the reflected light...... But what if the light doesn't bounce back? ”

"Then we won't be able to see it."

Tacit replied subconsciously.

"Yes." Hu Donghai pointed to the black ball in the box, "There is no electron reflected back." ”

"It may be that this material has the property of absorbing electrons and interacting with electrons...... "Tache reacted quickly, and immediately thought of a possibility.

"That's what we've thought of as well." "The bigger problem is that it doesn't just absorb electrons, and we discovered that when we were doing basic measurements of it: the short-pulse laser used to measure the length of the thing disappears without a trace as soon as it touches the surface of the thing...... Later, we tried other wavelengths of light, including infrared, ultraviolet, and even X-rays and γ-rays, and all of them went and never returned. ”

"Could it be that the scattering is too weak?"

"There's a photon that we can all find." Liang Jing shook his head, "But there is none." ”

Only then did Mo Yu realize why these men were here, presumably because their worldview had been subverted, and they might not be able to walk on an unstable road when they went out.

As far as human observation methods are concerned, there has actually been no fundamental change for hundreds of thousands of years, and 1.7 million years ago, Yuanmou people relied on sunlight, starlight and fire to observe the environment, and the light in the natural environment was diffusely reflected in the world, and finally received by the human eyeball, focused on the retina through the lens, and finally converted into images in the brain.

Modern humans have the ability to build huge accelerators and colliders with a diameter of hundreds of kilometers, and they fill low-temperature superconducting magnets in tunnels 100 meters deep underground, emitting a stream of protons with more than a trillion electron volts.

For hundreds of thousands of years, the tools used by human beings have become more and more advanced, and the energy they have mastered has become higher and higher, from natural sunlight to man-made fire, from fire to light, from photons to electrons, the smaller the object that needs to be observed, the larger the magnification that needs to be magnified, the higher the energy required, but no matter how advanced the technology, the logic of observation has never changed.

This logic is feedback.

Without feedback, without omnipresent reflections, the human eye would not be able to see anything.

"I'm going to try." Silent said.

"Whatever you want." Liang Jing took a step back and gave up his position.

The glove box is integrated with X-ray and γ-ray guns, Liang Jing is generally used for mineral element analysis, and Moyu is used to promote the genetic mutation of biological cells, she is also familiar with the road, remote control X-ray gun slowly unfolded, the muzzle is aimed at the sphere on the tray, the original transparent six sides of the box quickly turn ink, this is for light sensitization, on the other hand, to prevent radiation leakage.

Hu Donghai and Liang Jing stood on the side and watched, each of them did these operations once, but there was no difference in the results.

Adjust the wavelength to 0.2 nanometers, which is close to the upper limit of X-rays, and press the switch.

"You're on?" Lou Qi glanced at it, "Dabai, has it been turned on?" ”

"It's on." Mo Yu stared at the black ball in the box.

The glass box was silent, and the six dark smart photosensitive plates were as clear and transparent as the ink-colored glass, and Mo Yu circled around the glove box, frowning, no matter what happened after the X-ray came into contact with the black ball, whether it was absorbed or scattered, or through it, as long as there was a bunch of fish caught in the net, it would inevitably hit the surrounding photosensitive plates for people outside to see.

When Liang Jing used X-rays for elemental analysis, he tacitly saw what it looked like, and the photosensitive plate would be filled with jumping noise like an old TV with no signal.

The number on the display is zero.

This means that the X-rays disappeared in this closed box, and not a single fish escaped.

Acquiescing to adjusting the angle of the muzzle, changing it from vertical to oblique irradiation, little by little, until finally the muzzle was almost parallel to the surface of the black ball.

The number is still zero.

Mo Yu was angry, and simply took the X-ray gun to irradiate the photoreceptor, and in an instant, the photoreceptor lit up, and the dense highlights jumped wildly, like a fried pot.

The numbers on the display jerked.

The machine didn't break.

"You can also try other wavelengths." Lou Qi reminded.

Liang Jing nodded, "Try other wavelengths." ”

The wavelength was lowered from 0.2 nanometers all the way to 0.005 nanometers, and the emitted X-rays changed from extremely soft to extremely hard, but the number on the display never changed.

Zero.

"X-rays can't pass through it, they can't escape it, and all X-rays evaporate the moment they come into contact with this black ball, and they can be replaced by γ rays of higher energy." Hu Donghai turned off the X-ray irradiation system, and the wall of the glove box became colorless and transparent again, "It doesn't look like a real thing, but like a hole, and all the electromagnetic waves that irradiate it have escaped from this hole, so there is neither reflection nor transmission." ”

Hu Donghai said and smiled, this guess was really too mysterious, he didn't believe it himself.

"I thought of the black body." Mo Yu said that an object that can completely absorb electromagnetic waves is indeed easy to make people think like this.

Mo Yu is not a physics major, but she has heard of the famous blackbody model.

"There is no real absolute black body in nature, the black body is just an ideal theoretical model, not to mention that even the black body also produces radiation, not only the black body, but the black hole does, but this thing does not produce radiation, which is completely contrary to thermodynamics." Hu Donghai shook his head, "We tried all the means, tried all the way, and finally came to the conclusion that all electromagnetic waves with wavelengths lower than 380 nanometers and higher than 780 nanometers will be absorbed by this sphere." ”

"380 to 780 nm?"

Mo Yu faintly sensed something.

This interval was familiar to her, but she couldn't remember what it was.

"That's right, visible light." Liang Jing said in a low voice, "This is obviously the wavelength range of visible light, it has a reflectivity of less than one thousandth of visible light, this black ball will absorb almost all electromagnetic waves, but it will only reflect the visible light of the human naked eye, which is why we can see the reflection on its surface." ”

Mo Yu's scalp exploded suddenly.

"Isn't it scary?" Liang Jing smiled coldly, and that smile inexplicably reminded people of the muscle twitches of a dead man's face.

Mo Yu nodded silently.

"There's something even more terrifying." "This is the third important point we want to talk about next...... It not only absorbs electromagnetic waves, but also mechanical waves! ”