PAIDIA AKOUSTE ME. GIA FYSIKI EXO BISMA:
3o THEMA: SYMBOLI
4o THEMA: DOPLER SE KEKLIMENO KAI STIN AKRI TOU KEKLIMENOU KROUSI ME AKLONITO SOMA ____
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TO TETRAGONO SOMA PANO EINAI AKLONITO.KAI TO KYKLIKO KATO KINITAI
KAI OPOS EIPA EINAI DOPLER KAI STIN AKRI PANO KROUSI