Question

Conversion- from prefix to the base

1) 4000mm
2) 0.00000008Tb
3) 486dA
4) 0.002μW
5) 987GC

Answer 1

1) 4 m

Prefix "milli" (m) means $10^{-3}$. Therefore:

$4000 mm = 4000 \cdot 10^{-3} m = 4 m$

2) $8\cdot 10^4 b$

Prefix "Tera" (T) means $10^{12}$. Therefore:

$0.00000008Tb = 0.00000008 \cdot 10^{12} b =80000 b = 8\cdot 10^4 b$

3) 48.6 A

Prefix "deci" (d) means $10^{-1}$. Therefore:

$486 dA = 486\cdot 10^{-1} A = 48.6 A$

4) $2\cdot 10^{-9} W$

Prefix "micro" ($\mu$) means $10^{-6}$. Therefore:

$0.002 \mu W = 0.002 \cdot 10^{-6} W = 2\cdot 10^{-9} W$

5) $9.87\cdot 10^{11} C$

Prefix "giga" (G) means $10^9$. Therefore:

$987 GC = 987 \cdot 10^9 C = 9.87\cdot 10^{11} C$