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  • Blue and pink fireworks with black sky background.
    Rights: Image licenced through 123RF limited Published 14 March 2012 Size: 88 KB Referencing Hub media

    Fireworks show how light travels faster than sound. We see the light almost instantly, but the sound arrives later. To work out how many kilometres away the fireworks are, count the seconds until you hear the bang and divide by 3.

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