Question

the hammering on a train track is often heard twice by workers farther down the track; first as the sound travels through the steel and second as the sound travels through the air. this suggests which graph is true? a b

Explanation:

Step1: Recall sound - speed property

Sound travels faster through solids (like steel) than through gases (like air).

Step2: Analyze graphs

We need a graph where the speed of sound in steel is higher than the speed of sound in air.

Answer:

There are no complete graphs shown for options C and D. But among A and B, the correct - type of graph would have a taller bar for steel compared to air. Since in option A, the bar for steel is shorter than the bar for air and in option B the bar for steel is taller than the bar for air, the answer is B.