Author Question: The standard unit of time, the second, is now defined with reference to a. the Earth's revolution ... (Read 36 times)

APUS57 · **on:** Jul 28, 2018

The standard unit of time, the second, is now defined with reference to
a. the Earth's revolution period.
b. the mean solar day.
c. the cesium-133 atom.
d. the Earth's rotation period.

Question 2

The standard unit of length, the meter, is now defined with reference to
a. a meridian on the Earth.
b. the French meter.
c. the speed of light.
d. a platinum-iridium bar.
e. a member of the royal family.