Acoal-fired power plant with effective stack height of 100 m emits 1.2 g/s of so2 per mw of power delivered. if winds are assumed to be 4 m/s at that height and just over 3 m/s at 10m, how big could the plant be (mw) without having the ground level so2 exceed 365 μg/m3? (first decide which stability classification leads to the worst conditions.)

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.

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There are no answer choices, but a metaphor is a comparison between two objects that are not usually related without using like or as.