What is sound?, How is sound produced?, Can sound travel through a vacuum? Why or why not?, What are the three mediums through which sound can travel?, What type of wave is sound?, What is the SI unit of frequency?, Why does sound travel faster in solids than in gases?, What is a longitudinal wave?, Is sound a longitudinal or a transverse wave?, How do particles move in a longitudinal wave?, What are compressions in a longitudinal wave?, Why does sound need a medium to travel?, Can sound travel through outer space? Why?, What happens to the particles when a sound wave passes through a medium?

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