Question

Please help 100 points

Answer 1

B is it is 20 times

Answer 2

^Oh/umanhear=25x10^-6 meters =25um
Let x = 1x10^-5 y=2x10-4 x/y=10^-5/2.10^-4=0.5x10^-1. X=0.05y
10000nm
3x10^-7 meter