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One 'rule of thumb' that many of us oldtime engineers carry in our decomposing

mental toolboxes is: 1 foot = 1 nanosecond. Since you asked, I'll calculate it now,

and see how close it is:

Speed of light in vacuum = 299,792,458 meters per second.

Use 1 meter = 3.28084 feet

Speed of light = 983571000 feet per second.

Speed of light = 0.98357+ foot per nanosecond

"1 foot = 1 nanosecond" is within 1.65 percent of being accurate.

2.5 feet (in vacuum) takes 2.5418 nanoseconds (rounded)

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11y ago

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