Det sägs att i rymden kan ingen höra dig gråta. Det stämmer faktiskt! Det beror bl. a. på att det inte finns några människor som kan höra dig där, men det finns en till orsak. Vilken?
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Eftersom att den longitudiella vågen måste konkurrera med den transförsella vågen mer i rymden Ljud kan inte föras i vakuum, eftersom att ljud behöver färdas genom ett medium. Det finns inget luftmotstånd i rymden En bil passerar när du står på vägrenen, du kan då höra att frekvensen på motorljudet ändras ljust som bilen passerar dig. Vad beror det på?
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Ljudet behöver färdas mindre Ljudet behöver färdas mer Bilen som kör påverkas av friktionen vilket ändrar ljudet eftersom att bilen har mest friktion när den är närmast dig När man snärtar till med en piska i luften hör man ett smällande ljud. Vad tror du att det beror på?
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Piskan flyttar luften så att det bildas ljudvågor Antalet Hertz ökar när piskan slår ner För att mästaren Indiana Jones gjorde så En trådantenn på hustaket tar emot radiosignaler. Om du skulle bygga en trådantenn som tog emot ljusvågor, hur skulle den se ut då?
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Som vanligt fast mycket, mycket mindre Om du lyssnar på musik från en radio i ett rum fyllt med helium, hur skulle ljudet låta då?
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