alleryThunder is heard 3 seconds after a flash. About how far is the strike?
AAbout 100 m
BAbout 1 km
CAbout 10 km
DAbout 3 km
Answer & Solution
Correct answer: B. About 1 km
1. Sound travels about 343 m each second.
2. In 3 seconds it covers about 343 x 3 = about 1,029 m.
3. That is about 1 km; light travel time is negligible.
_Source: Wikipedia, Lightning, The distance approximation trick_
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