雷の音はなぜ遅れて聞こえる？
When you see lightning and then hear thunder a few seconds later, it's because light and sound travel at different speeds. Light travels extremely fast?about 300,000 kilometers per second. On the other hand, sound moves much slower, at about 340 meters per second in air. So when lightning strikes far away, the light reaches your eyes almost instantly, but the sound takes more time to reach your ears. This delay helps us estimate how far the storm is. For every 3 seconds between lightning and thunder, the storm is about 1 kilometer away.
