Physics, 26.05.2020 22:00, andrewjarrah05

Which kind of wave would be observed in outer space between planets, where there is very little matter?
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an electromagnetic wave, such as an X-ray
an electromagnetic wave, such as a sound wave
a mechanical wave, such as an X-ray
a mechanical wave, such as a sound wave
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Which kind of wave would be observed in outer space between planets, where there is very little matt...