Question

convert 20 picometer into nanometer

Answer 1

One pico meters = 10minus 12 meters
So 1 pico meter = 10minus 3 nano
meters
So 20 pico meters = ?

2*10* 10minus 3 nano meters
i.e,
2*10minus 2 nano meters

Answer 2

$1 \: picometer \: = 1pm = {10}^{ - 12} m \\ 1 \: nanometer \: = 1nm = {10}^{ - 9} m \\ \\ 20 \: picometer \\ = 20pm \\ = 20 \times {10}^{ - 12} m \\ = 20 \times \: {10}^{ - 12} m \: \times \frac{ {10}^{3} }{ {10}^{3} } \\ = \frac{20}{ {10}^{3} } \times \frac{ {10}^{ - 12} }{ {10}^{3} } m \\ = \frac{20}{1000} \times {10}^{ - 12 + 3} m \\ = 0.02 \times {10}^{ - 9} m \\ = 0.02nm \: ( {10}^{ - 9} m = 1nm)$
Hope this help.....There a mistake...see snap for the error..