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  Physics: there is lightning and thunder, how far away is the storm?
   
   
 
 
 
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19th Jul 2012, 6:11 AM
Hi.

I know there is some really easy trick to find out how far a lightning storm is? I really don't remember but I far as I know it something like 4 seconds after the lightning?

Can you please explain me how can I calculate it?

changed: mat (19.7.2012 ob 06.27.12)
 
 
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19th Jul 2012, 6:36 AM
If I remember correctly and I'm pretty sure I do it goes like this:

When you see a lightning start counting the seconds immediately and stop counting when you hear the thunder. One second means you are 1 mile (1.6 km) away from the storm.

To explain little further, thunder and lightning happen at the same time it's only due to the fact that light travels faster than sound, that you first see the lightning and hear the thunder after.

So *LIGHT* 1,2,3,...*SOUND* and you know approx. how much time you have to take cover.

TD

changed: TheDude (19.7.2012 ob 06.39.22)
 
 
 
   
   
 
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