Seven seconds after a brilliant flash of lightning, thunder shakes the house. Approximately how far was the lightning strike from the house?
A) much farther away than two kilometers
B) about one kilometer away
C) much closer than one kilometer
D) about two kilometers away
E) It is impossible to say.

Question

Quizplus · Accepted Answer

Sound travels through air at approximately 343 meters per second. Since thunder is heard 7 seconds after seeing lightning, the distance can be calculated as 343 meters/second * 7 seconds = 2401 meters, which is about 2.4 kilometers, making the answer approximately 2 kilometers away.

Seven Seconds After a Brilliant Flash of Lightning, Thunder Shakes