-In memory of great men
I have studied physics for nearly ten years. Life can last for decades, and in the face of hurried time, my heart is always melancholy. Well, on the whole, my grades in physics are not very good, but this can't reduce my love for physics. When reading sci-fi articles, some people's application of physics knowledge made me love physics more and let me know something about physics.
When science is still in the age of ignorance, many people are willing to be enemies with the whole world for the sake of science and truth, even if they are burned. They are like Prometheus in Greek mythology, and there is more than one. Faced with a world like Zeus, they would rather die than surrender and always believe in the truth. With the progress of science, people have to admit that the earth is not the center of the universe, and the earth always revolves around the sun.
When Watt made the steam engine, when the first steam ship was launched for testing, some people laughed at its clumsiness, but science made it the pride of mankind. When it sails on the ocean, it turns the ocean into a strait.
Apple landing is nothing, but when it hits a person who likes to think and explore the essence of things, hehe, gravity is born. Makes me feel how beautiful the world is, doesn't it?
When a person is laughing heartily, some people say that he is crazy. Yes, he is crazy, but he dares to say, "Give me a fulcrum and lever long enough, and I can move the earth". Who but Archimedes had such courage at that time?
Maybe you don't respond to a small compass, but what do you think when you get lost in the jungle adventure? Do you know how exciting the compass was when it was invented? How many people did it help?
If we talk about X-rays, we don't think of anything, but when we talk about Roentgen rays, I think of machines that let us see human bones and enable doctors to save lives better. I think the greatness of physics. The power of science.
When I was reading Russell's Paradox, one day, the barber in Saville Village put up a sign: "I cut the hair for all the men in the village who don't cut their own hair. I only cut their hair for these people." So someone asked him, "Who will cut your hair?" The barber was speechless at once. Because if he cuts his own hair, then he belongs to the kind of person who cuts his own hair. However, the sign says that he doesn't cut such people's hair, so he can't cut it himself. If another person cuts his hair, he is the one who doesn't cut his own hair. The sign clearly says that he will cut all men who don't cut their own hair, so he should cut his own hair. It can be seen that no matter what the inference is, what the barber says is always contradictory.
This famous paradox is called "Russell Paradox". It was put forward by the British philosopher Russell, who expressed a famous paradox about set theory in a popular story, which was extremely simple and clear. And shook the foundation of mathematics, resulting in the third "mathematical crisis." Since then, in order to overcome so many paradoxes, mathematicians have done a lot of research work, produced a lot of new achievements and brought a revolution in mathematical concepts.
Faced with these, I am confused, but more sober. Science needs dialectical treatment and in-depth thinking. As long as we treat things scientifically, human beings can move forward correctly.
In fact, what surprised me most was Schrodinger's Cat.
The concept of "Schrodinger's cat" is that according to quantum principle, there should also be superposition of states in the macro world. Schrodinger, put a cat in a closed iron cage with a sealed gas bottle, a radioactive atom, a detector that can detect the emitted alpha particles and a hammer connected to the detector. A radioactive atom that may or may not decay, releasing alpha particles. If it decays and is caught by the detector, the hammer will fall and smash the bottle, the poison gas will be released and the cat will die. If it doesn't rot, the bottle will be fine and the cat will survive. So keep a kitten for an hour. Is the kitten dead or alive, dead or alive, dead or alive, or dead or alive? Schrodinger said he didn't know whether to open the box or not. Because according to quantum mechanics, this atom should be in the superposition state of decay and non-decay. There is a 50% chance that it will decay and a 50% chance that it will not decay. So this kitten will also be in a state of superposition of life and death.
This is a novel principle, right? I often think, if people are among them, isn't that what emperors of all ages dream of living forever? Ha ha. If those emperors know physics, who wants to try?
It's hard to write about everyone in a short space, but I can only complain to the sky: physics is amazing and physicists are great. Even if I spend my whole life, it is difficult to learn a drop of vast knowledge. There is no end to learning and no end to thinking.