HOW THE WORLD WORKS · Ep. 5

The Slow Sound

Why does the thunder reach you after the flash?

The film asks: Do you count? · Always / Never / Since today

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What it says

Why does the thunder reach you after the flash?
Because light and sound leave the strike together, but light runs and sound walks.
Light crosses the sky in no time. Sound takes about three seconds for every kilometre.
Count the seconds between the flash and the boom, divide by three, and that's how far it is.
When the gap shrinks, the storm is coming to you.
Do you count?

05). A farm porch in a night storm. Lightning strikes a far tree: a runner (light) and a walker (sound) leave the strike together and cross the field toward the porch; the runner is there at once, the walker takes seconds. A counter on the porch counts the gap; divide by three; the storm creeps closer as the gap shrinks.

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