Question

the correct prefix for the multiplier 0.000001 is
nano
micro
mega
milli
none of the above

Explanation:

The prefix "nano -" represents $10^{-9}$, "micro -" represents $10^{- 6}$, "mega -" represents $10^{6}$, "milli -" represents $10^{-3}$. The number 0.000001 can be written as $1\times10^{-6}$, which corresponds to the "micro -" prefix.

Answer:

B. micro