How far away is lightning if thunder sounds 10 seconds after the lightning flashes?

How far away is lightning if thunder sounds 10 seconds after the lightning flashes?

Thursday, August 31, 2017

6:15 PM

"How far away is lightning if thunder sounds 10 seconds after the lightning flashes?

10 miles
5 miles
8 miles
2 miles

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· 10 miles

· 5 miles

· 8 miles

· 2 miles – answer

When there is a 10-second interval between seeing lightning and hearing thunder, the lightning is about two miles distant. Sound travels about one mile in five seconds. When lightning forms, the air surrounding it heats up to around 50,000 degrees Fahrenheit. When this air cools, a partial vacuum forms around the lightning’s path. The air nearby reacts by expanding and contracting, causing a series of vibrations, which produces thunder. Source: ScientificAmerican.com