On a day when the speed of sound in air is 340 m/s, a lightning bolt is observed and the resultant thunderclap is heard 5 seconds afterwards. About how far away was the lightning bolt?
A) 1020 m
B) 170 m
C) 1700 m
D) 680 m

Question

Quizplus · Accepted Answer

The distance (d) can be calculated using the formula:
d = speed × time
In this case, the speed is the speed of sound in air, which is 340 m/s, and the time is 5 seconds.
So, 
d = 340 m/s × 5 s
d = 1700 meters 
Therefore, the lightning bolt was about 1700 meters away from the observer.

On a Day When the Speed of Sound in Air