2004.08.31 Answer to the Poll...
Question: Speed of light in free space is c=3x10^8 m/s. Find the time (in secs) for the light to travel 1 m.
Answer: 3.3x10^-9 secs
7 answered that question correct.
Here's the proof...
Since speed is a measure of distance over a length of time, the basic equation can be written like this:
Speed = Distance / Time
Since we're looking for the length of time to traverse 1 meter, the equation can be re-written to solve for time:
Time = Distance / Speed
We plug in the values:
Time = 1 meter / 3.3x10^8 (meters / second)
Now, we multiple 1 second to both the numerator and the denominator which will cancel out the seconds that's in the demoninator and leaves the unit of measure as (meters * seconds) in the numerator. But because meters in both the numerator and the denominator cancel each other out, leaving out seconds in the numerator position.
Time = ( 1 / 3.3 x 10^8 ) seconds OR 3.3 x 10^-9 seconds
Posted by John Highway
at August 31, 2004 07:52 PM | TrackBack