Lightning is an electric spark produced by the charge generated in the process of cloud movement during discharge, which has both light and sound. It's just that the light and sound in lightning are stronger than the electric sparks we see in our lives.
The reason why you see lightning first and then hear thunder is because in the air, light travels fast and can reach the ground soon, while sound travels slowly in the air and will reach the earth in a short time. So you will hear lightning first, and then thunder. In fact, lightning and thunder appear at the same time.
The reason why the time to reach the ground is so different is that the speed of light is 3,000,000 kilometers per second, while sound can only travel 0.34 kilometers in the air for 65,438+0 seconds. The speed of sound is only one-ninth of the speed of light.
Lightning is long and short, loud and quiet. You can roughly judge the height of clouds from the ground according to the time when the sound reaches the ground. It doesn't take much time for light to reach the ground, which can be considered as 0. How many seconds is the interval between seeing lightning and hearing thunder multiplied by 340 meters, which is the distance from lightning to you.
Lightning will reflect when it meets clouds or tall buildings, so it usually takes some time for lightning to disappear after lightning.
If you are satisfied with my answer, please choose the best answer. Thank you.
References:
/mid/why/shi9.html