A sound wave from a jackhammer travels through a section of concrete with a fixed frequency. At the concrete's boundary is mud. The diagram below shows the path of the sound wave as it travels from the concrete into the mud. What happens to the sound wave when it passes from the concrete into the mud? A. Its direction and speed remains the same. B. Its direction and speed changes. C. Its direction changes but speed remains the same. D. Its direction remains the same but speed changes.

It might be too late now, but the correct answer for the question is B.

Explanation:

According to the graph you can see when it hit the boundary of the mud it curved downward making the direction change; which then the mud probably had a hollow shell, where the speed was moving much faster.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds