When the outdoor emergency warning siren at Cheryl's school was tested, the sound from the siren took 7.0 s to reach her house located 2.40 km from the school. What is the speed of sound in air?
A)240 m/s
B)340 m/s
C)440 m/s
D)540 m/s
E)640 m/s

Question

Quizplus · Accepted Answer

The speed of sound can be calculated using the formula: 
speed = distance/time 
In this case, the distance is 2.40 km (2400 m) and the time is 7.0 s. 
Therefore, the speed of sound in air is: 
speed = 2400 m/7.0 s = 342.86 m/s
Rounded to the nearest ten, the answer is 340 m/s, which corresponds to choice B.

When the Outdoor Emergency Warning Siren at Cheryl's School Was