8 minutes and 20 seconds

Light travels in a vacuum at 186,282.4 miles per second or 299,792,458 meters/second.

(a) how many miles does a pulse of light travel in a time interval of 0.1 s, which is about the blink of an eye? Δx = 3 mi (b) compare this distance to the diameter of earth. (use 6.38 106 m for the radius of the earth.)

The earliest technical usage for jiffy was defined by Gilbert Newton Lewis (1875–1946). He proposed a unit of time called the “jiffy” which was equal to the time it takes light to travel one centimeter in a vacuum (approximately 33.3564 picoseconds).

11. Distance of Light Travel How far does light travel in the time it takes sound to travel 1 cm in air at 20°C? Sound velocity is 343 m/s, so sound takes 310 5 s to travel 1 cm. In that time, light travels 9 km.

299,792,458 metres

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Damn Your Eyes: The Ugliest Cars Ever Made

• 1932 Stout Scarab. See all 31 photos.
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• 1961 Citroen Ami 6. See all 31 photos.
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