anonymous one year ago The Radius of a Copper atom is 128 pm. What is the diameter (in micrometer), circumference (m), and area (km^2) of it?

1. cuanchi

you need the following formulas and conversion factors, where r= radius; π=3.14) $diameter=2 r$ $circunference=2\pi r$ $area=4\pi r^2$ $\frac{ 1\mu m }{10^6 p m }$ $\frac{ 1\ m }{10^{12} p m }$ $\left( \frac{ 1km }{10^3m } \times \frac{ 1m }{10^{12} p m }\right)^2=\frac{ 1km }{ 10^{30}p m }$

2. anonymous

a)$2.56 x 10^{-7}$ b) $2.56 x 10^{-10}$ c) $5.12 x 10^{-13}$ Is that right, @Cuanchi ?

3. cuanchi

NOOO!!! a) 2.56x10−4 b) 8.04x10-10 c) 2.06x10-10