Figure 1 shows the forces acting on a car while it is moving. What is the resultant force acting on the car when it is travelling at constant velocity

The anwser is: wave a has a greater pitch and frequency.

Hey did u get the answer?

Iwould think it would be efficiency.

Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.