Question

Given that a kilogram of copper contains about 10power 25 atoms and that density of copper is about 9000kg/m3,estimate the diameter of the copper atom

Answer 1

Answer:

a current of 1.0 A exists in a copper wire of cross section 1.0 mmsquare. assuming one free electron per atom calculate drift speed of free electrons in wire . the density of copper is 9000 kg / m 

Expert Answer:

Current I related to drift velocity vd is given by

 

I = n×e×A×|vd| 

 

where n is the number density of atoms , e is the charge on electron, A is area of cross section.

 

gram atomic weight of Copper atom 63.5 ; number density of atoms  is given by

Answer 2

sorry dont know the answer