what is point 1?, amplitude , wavelength , crest , Who invented Waves?, Gessi , Heinrich Hertz , Albert Einstein, longitudinal waves contain:, crests and trough , compression and refraction , choose the right answer: a form of radiation that travel though the universe, longitudinal waves , transverse waves , mechanical waves , electromagnetic waves , When were waves discovered , early 1880, late 1880, 1979 , 2023 , Where will sound travel Faster?, Liquid, Gas, Solid , 8G2 classroom .

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