Question

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

Answer 1

you need the following formulas and conversion factors, where r= radius; π=3.14)

\[diameter=2 r\]
\[circunference=2\pi r\]
\[area=4\pi r^2\]

\[\frac{ 1\mu m }{10^6 p m }\]
\[\frac{ 1\ m }{10^{12} p m }\]
\[\left( \frac{ 1km }{10^3m } \times \frac{ 1m }{10^{12} p m }\right)^2=\frac{ 1km }{ 10^{30}p m }\]

Answer 2

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

Answer 3

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