The lack of basic scientific literacy on here is even worse than I thought...Speed (v
) is defined
as a derived quantity, distance d
covered per unit time t
If you measure the base quantities (here distance and time) a derived quantity (here speed) is defined by, that is
a direct measurement of the derived quantity, whether for light or anything else. The clue's in the name of the paper: "A small tabletop experiment for a direct measurement
of the speed of light".
After 26 years of workdays spent watching bacteria multiply, Richard Lenski has learned that evolution doesn’t always occur in steps so slow and steady that change can’t be observed.