During the curing of a battery plate, which of the following takes place? a. the active material dries and becomes hard. b. problems in the plate are corrected. c. the active material is converted to the charged state. d. the active material is converted to lead oxide.

Ithink your answer is d

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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.