Lydenergi: lyd spredes ikke i et vakuum. Vi sætter en elektrisk klokke i en lukket klokke, og så tømmer vi den. Anonym illustration fra 1925. Privat samling.(Sound energy: sound does not spread in a vacuum. We put an electric bell in a closed bell and then we empty it. Anonymous illustration from 1925. Private collection.)Anonymous Anonymous |
€ 122.69
Enthält 25% MwSt.
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Udateret · Engraving
· Billed-ID: 915769
Private Collection / Bridgeman Images |
0 Anmeldelser |