صواب: the lowest point in the longitudinal wave isthrogh , the light wave is wave that come form the sun for exmpel , electromagnetic waves can thrvel trow midum, if we can run at the same fast as light you can trevel  can trvel in the time, خطأ: sesmic wave is wave in the sky , sound wave can travel trow epmty spase , light can trevel trow epmty spase,

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