- #1
babaliaris
- 116
- 15
I'm reading a book from the authors Halliday and Resnick and it says that
I understand that, and it also make sense if you plug in these values into the dx formula of motion (you get dx = 1m)
but how did we calculate the speed of light in m/s very precisely before redefining the meter? The calculation of the speed depends in the previous definition of the meter right? So how does this new definition of meter can use the speed of light which was calculated using another definition of the meter? It does not really make sense to me...
Code:
The meter is the length of the path traveled by light in a vacuum
during a time interval of 1/299 792 458 of a second.
This time interval was chosen so that the speed of light c is exactly
c = 299 792 458 m/s.
I understand that, and it also make sense if you plug in these values into the dx formula of motion (you get dx = 1m)
but how did we calculate the speed of light in m/s very precisely before redefining the meter? The calculation of the speed depends in the previous definition of the meter right? So how does this new definition of meter can use the speed of light which was calculated using another definition of the meter? It does not really make sense to me...