time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)
Another question on Mathematics
Mathematics, 21.06.2019 16:00
In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?