What is light? Before the discovery of modern science, there were many legends about the god of light and the sun, such as Kuafu chasing the sun, Houyi shooting at the sun, and endless imagination of the reincarnation of the sun and the moon.
However, modern science thinks that light is both electromagnetic wave and photon flow, that is, electromagnetic wave theory and photon theory. Light belongs to the category of physics in modern science. It contains energy and is the carrier and manifestation of energy.
There is the intensity of light, the banter that blinks people's eyes, and the lumen as dark as fireflies. The light is colorful, colorful and bright as a rainbow. There is always light, and everything grows on the sun. The sun is bright and it will be dark.
Humans yearn for light and hate darkness, because light can make people open-minded and energetic. And darkness can make people listless and calm. Because human beings are eager for energy and praise life. The fear disappeared.
In fact, light is the carrier of energy, and the existence of life cannot be separated from proper energy.
People can feel light through their eyes and warmth through their skin. That's because light with a specific frequency can make people's eyes receive and generate electrical signals, thus stimulating the corresponding cerebral cortex and producing the effect of brain nerve cell reflection. The energy contained in light vibrates the sensory cells of human skin, produces thermal motion, stimulates the corresponding cerebral cortex, and obtains a warm feeling. In other words, human eyes are essentially photoelectric sensing elements, which convert optical signals into electrical signals, while skin is a photothermal sensing element, which also converts optical signals into temperature differences to generate electrical signals.
Light can produce photosynthesis of plants, making the earth full of vitality, vitality and prosperity in full of green. Light contains energy, which makes the earth warm and cold alternately, and the years go on and on, keeping young forever. There are thousands of bare breasts, which make human beings in a colorful, colorful and colorful picture.
Light flies fast, which is the fastest particle in the universe and unparalleled. A single photon is extremely small and extremely fast, and its trajectory is in a compound state, not a simple single motion state, so there is a saying that a photon is a compound motion electron flow.
Light is the most difficult physical phenomenon for human beings to understand, because light not only has the characteristics of electromagnetic waves. And photoelectric effect, the characteristics of particles. Because the speed of light is too fast to be measured statically, it is also the most common and mysterious field for human beings to explore nature. It embodies the realm of human scientific wisdom.