A Complete Collection of 100000 Whys
Fav十万个为什么
为什么雷声比闪电延迟出现？
简单的摘要：雷声比闪电延迟出现，主要是由于光速远快于声速、雷声需要时间传播以及闪电与雷声同步发生但传播速度差异。
1、光速远快于声速：闪电和雷声是同时发生的，但光速（约每秒30万千米）远快于声速（约每秒340米），因此人们几乎瞬间看到闪电，而雷声需要时间传播。
2、雷声需要时间传播：雷声是闪电发生时空气急剧膨胀产生的冲击波，需要通过空气传播。由于声速较慢，雷声到达观察者耳朵的时间比闪电的光延迟。
3、闪电与雷声同步发生但传播速度差异：尽管闪电和雷声同时产生，但由于光速和声速的巨大差异，人们总是先看到闪电后听到雷声。这种延迟时间可用于估算闪电的距离。
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