Question

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You see a bolt of lightning and hear thunder two seconds later. The speed of sound is about 343 m/s. Estimate your distance from the lightning bolt?

600 m
1,800 m
10 m
40,000 m

Answer 1

Answer: 600 m

Explanation:

Speed $V$ is defined as the distance traveled $d$ in a especific time $t$:  

$V=\frac{d}{t}$  

Where:  

$V=343 m/s \approx 300 m/s$ is the speed of sound  

$t=2 s$ the time you hear the thunder after you see the flash of lightning  

We need to find the distance at which you are from the lightning strike:  

$300 m/s=\frac{d}{2 s}$  

Finding $d$:  

$d=(300 m/s)(2 s)$  

Finally:  

$d=600 m$