When thunder strikes, we usually see a streak of lightning followed by Then heard a loud noise. We will find that we see the lightning first and then hear the sound. Why is this?
In fact, this phenomenon can be explained from the perspective of physics. When lightning occurs, it will quickly release a large amount of charge, which will flow rapidly in a short period of time to form a current, which is the so-called "lightning current." This current will form a strong electromagnetic field, causing the gases in the air to ionize, forming a bright light, which is what we see as lightning.
At the same time, because electromagnetic waves propagate very fast in the air, about 300,000 kilometers per second, we can see lightning immediately. The propagation speed of sound is relatively slow, about 340 meters per second. When lightning occurs, the energy released is so huge that the surrounding air is instantly heated and expanded, forming a shock wave. This shock wave is the "thunder" we hear. Because sound travels relatively slowly, we hear the sound slightly later than we see the lightning.
It should be noted that this phenomenon is only apparent when the lightning is farther away from the observer. If the lightning is relatively close to the observer, the time difference between lightning and thunder may be only a few milliseconds, almost simultaneously.
Finally, we need to remind everyone that during thunderstorms, the current and electromagnetic fields released by lightning are very powerful and may cause harm to the human body. Therefore, when encountering thunderstorms, never stand in the open air. It is best to hide indoors or in a car to ensure your own safety.
Articles are uploaded by users and are for non-commercial browsing only. Posted by: Lomu, please indicate the source: https://www.daogebangong.com/en/articles/detail/da-lei-shi-xian-kan-dao-le-shan-dian-er-hou-cai-ting-dao-sheng-yin.html
支付宝扫一扫 
评论列表（196条）
测试