Why can we see lightning before we hear thunder?
Answer:
We see lightning before we hear thunder because light travels much faster than sound. During a lightning strike, the electrical discharge rapidly heats the surrounding air to extremely high temperatures. This causes the air to expand suddenly and produces the powerful sound waves that we hear as thunder. The light from the lightning travels through the atmosphere at approximately 300,000 kilometers per second, so it reaches our eyes almost instantly, even when the storm is several kilometers away. Sound, on the other hand, travels through air at about 343 meters per second under typical conditions, making it much slower. Therefore, although the flash of lightning and the sound of thunder are produced almost simultaneously, we see the flash first and hear the thunder later. The time gap between them can also give us an approximate idea of how far away the lightning occurred: the greater the delay, the farther away the lightning strike is likely to be. This simple phenomenon demonstrates the significant difference between the speeds of light and sound.
