Science Fair Project Encyclopedia
In 1 ns, light travels exactly 29.9792458 cm in a vacuum (via the definition of the metre). But the speed of light is slower in materials, indicated by an index of refraction greater than 1. Thus in air (1.003), light travels about 29.89 cm in 1 ns, but it travels only about 22.54 cm in water (1.33) each nanosecond.
- 1 E-9 s for a list of times on the order of 1-10 nanoseconds
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