Which represents the smallest number a.3.8 x 10^7 b.3.8 c.3.8*10^-18 d.3.8*10^15

Arranging these numbers in a vertical column makes it easier to rank them by size:

A.3.8 x 10^7

B.3.8

C.3.8*10^-18

D.3.8*10^15

That factor 10^15 in D is by far the largest power of 10 in this list. The correct answer is D.

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)