45k=84

k

Help me please !

k = 1.87

Step-by-step explanation:

Given that,

An expression 45k = 84

We need to find the value of k.

It can be calculated as follows :

Divide both sides by 45,

So, the value of k is equal to 1.87.

0.02

step-by-step explanation:

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)