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Hvordan virker ECHO?

Spejlene vil flyde billederne og sende lyset tilbage. Væggene sender også stemmerne tilbage. Hvis du står lidt længere væk fra en høj væg eller en stor klippe, vil du høre din stemme dreje tilbage et par sekunder senere.

Hvis en lydbølge støder på en væg eller en høj og bred klippe overflade, roterer den bagud mod kilden. Det er sådan ekkoet sker. Hvis den udpakkede lyd er kort, og lydbølgerne når batteriet som normalt, høres ekkoet tydeligt. Spor af Øresund forbliver i øret i 1/10 sekunder.

Fordi hastigheden af Øresund i luften er 340 meter per sekund, skal afstanden mellem lydkilden og batteriet for at være et ekko være mindst 17 meter.

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