3cm=( )nm=( )um=( 3cm=( )nm=( )um=( )
1m = 1000000um = 1000000nm, so 3cm = 300000um = 3000000nm
0.25m= um= nm
Please use scientific counting,
0.25m=0.25*10^6um=0.25*10^9nm
It is expressed by scientific counting method
0.25m=2.5*10^5um=2.5*10^8nm
0.05mm=__ um=__ nm
50 5x10 4 times