Chapter 2347 Archimedes

"Laser ignition? No, this plan has already been discussed! The laser will diffract during emission! Such a long distance, even if the laser can reach the detonation point, the spot will spread due to diffraction, and the energy released per unit area will also be large." It will be diluted, and it will not reach the energy intensity required to ignite the mixed gas!" Some scientists made a judgment with just a glance.

Contrary to the subconscious understanding of ordinary people, the laser is not a straight line, it is just more condensed than the light emitted by the flashlight, and the degree of scattering is lower, but it is not impossible to scatter.

Let’s take the most common laser as an example. Generally, the laser pointer sold as a toy on the market uses a laser module made of glued crystals, which are generally green light with a wavelength of 532nm, and a diameter of 1.5mm for the output port. The laser pointer emits laser light, and the light spot irradiated five meters away will spread into a circular spot with a diameter of one centimeter.

According to this ratio, if a laser beam is launched on the earth and projected on the moon, the distance between the earth and the moon is 384403.9 kilometers. If this laser pointer can shine on the moon and we can see it, the diameter of its spot will reach 653.4 kilometers. You must know that the diameter of the moon is only 3476.28 kilometers.

The area of ​​the light spot projected by the laser pointer on the moon will become extremely large. Of course, the light spot will definitely not be visible to the naked eye, because the laser light is scattered, and the visibility of the light spot projected on the moon is extremely low, which is already less than the billions of light reflected by the moon itself. One ten-thousandth, the naked eye has been unable to observe.

Controlled nuclear fusion needs to be ignited with a strong laser, so the world of the wandering earth has been deeply researched in the field of lasers. People have long thought of using lasers to ignite the mixed gas between the earth and Jupiter, but even the lasers possessed by planetary engines The emitter can emit a lower degree of laser scattering, but as long as it is multiplied by the long distance from the earth to the detonation point, when the laser reaches the detonation point, the energy per unit area is not enough to detonate the mixed gas.

This is the same as the sunlight scattered by the sun. The sun is like a huge nuclear fusion reaction device, which can convert 40 billion tons of matter into energy every second, a large part of which is converted into light energy. If Without scattering and attenuation, the earth would have been evaporated by the sun long ago.

"In addition to scattering, the atmosphere will also attenuate the power of the laser. Although the earth's atmosphere is already very thin, it will still greatly consume the energy of the laser. At the same time, the mixed gas between the earth and Jupiter will further cause energy attenuation. , Therefore, even if we use the most powerful laser transmitter developed by human beings, the laser emitted is not enough to ignite the mixed gas in the umbilical cord space!" The scientist shook his head and said, "We don't have much time to It's a waste, let Lieutenant Colonel Liu Peiqiang carry out his plan!"

Hearing this, Liu Peiqiang put his hand on the escape button of the life support module again, but what another scientist said prevented him from pressing the button immediately.

"No, this plan does not use a beam of laser light to irradiate the tipping point!" The scientist who first saw the plan swiped the screen to the next page, and the pattern on this page revealed the truth of the plan.

"This is... Archimedes?" Seeing this scene, many scientists thought of the ancient Greek mathematician and physicist who lived more than 2,300 years ago.

"Yes, this plan is the same as that of Archimedes who used mirrors to burn down the Roman fleet led by Marcellas! The energy intensity of one laser beam is not enough, so use a thousand or ten thousand laser beams! These lasers are aimed at the same area for irradiation, and thousands of laser beams are superimposed,

Even if there is energy weakening caused by scattering and atmosphere, the energy intensity required to ignite the mixed gas can still be achieved! "The earliest scientist shouted, "This plan must work!" "

Legend has it that when Archimedes was old, a war broke out between Syracuse, the city-state where he lived, and Rome. The supreme commander of the Roman army, Marcellus, led a huge fleet to attack. Fend off Marcellas' army.

Although Archimedes didn't like war, he didn't want his hometown to be destroyed by the enemy, so he thought of a way. He asked women and children to come to the coast with mirrors in their homes, so that the mirrors could be destroyed. Aim at the strong sunlight and focus on the mainsail of the enemy ship. The reflection of thousands of mirrors is concentrated on one point of the sail, and the sail is burning. The fire is taking advantage of the wind and burning more and more. They didn't know how the sails burned at all, and thought that Syracuse was blessed by the gods, so they dared not continue to march, and hurriedly withdrew with the rest of the fleet.

Of course, this is just a fable and cannot stand scientific verification. First of all, even bronze mirrors were luxury goods in the era when Archimedes lived. It is hard to say whether so many mirrors can be found in the ancient city of Syracuse.

Secondly, the reflection ability of copper mirrors is far inferior to that of glass mirrors. Even if you find so many mirrors, it may be difficult to succeed.

In addition, pointing many mirrors at one place at the same time is not a task that can be completed by naked eye judgment. The popular science program "Mythbusters" verified this legend. They found that when the mirrors rise to twelve Therefore, it is difficult for the person who operates the mirror to know which beam of light is reflected by the mirror he controls.

According to the test results of the show, at a distance of 140 feet, 300 copper mirrors are used to make the stationary hull smoke, and when the mirrors are aimed at the sails, a large amount of heat is lost, because the sails are white, and the wind blows all previous efforts. .

Finally, at a distance of 75 feet, a glass mirror was used to ignite the stationary hull, but such a short distance was enough for the Romans to attack, so Archimedes' plan did not have practical value.

Similar verifications have been done in history. In 1747, Earl Dubufen used 168 glass mirrors to burn wood 150 feet away, but it was wood coated with creosote; in 1973, Greek scientist Ioni Shaka Dr. Si, he asked 60 sailors to hold a reflector 6 feet long and 2 feet wide, and ignite a splint nailed to the rowboat 160 feet away, but these also have no practical value.

In the future, scientists on Earth also tested similar weapons, but they all gave up for the same reason.

However, transferring this idea to the crisis faced by the world of "The Wandering Earth" has strong operability. It is impossible to accurately control so many laser emitters to aim at one area at the same time by relying on manpower, but moss can do it. It can distinguish The landing point of each laser beam does not depend on the naked eye.

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