Chemistry, 15.04.2021 21:10, ellenharley7

I have a couple of questions ... Waves that we cannot actually see (unlike ripples in water) and those that DO need a medium to travel through belong to which category of waves? an How do astronauts overcome this obstacle (answer #3) when communicating in space? Thanks

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I have a couple of questions ... Waves that we cannot actually see (unlike ripples in water) and tho...