Denver ignites a firecracker.

Question

The sound is reflected from a wall located at a distance of 275m away and the echo is heard 1.6s after. what is the speed of sound?

ans. 340m/s

 

ps. How can I get the right answer?

Answer 1

speed = (distance traveled) / (time of travel)

 

v = d/t

 

d = twice the distance from the site of the firecracker explosion to the wall (i.e. round trip distance)

 

d = 2(275 m) = 550 m

t = 1.6 s

 

v = 550/1.6 m/s = 343.75 m/s

 

You can round off v to 340 m/s.