How many conduction electrons are there in a 1.50 mm diameter gold wire that is 20.0 cm long?

The diameter of gold wire is 1.50 mm.

Therefore, the radius of gold wire is $\"\"$ .

The length of the wire is $\"\"$

Find the volume of the wire.

Volume of the wire is $\"\"$ , where $\"\"$ is the area of the wire and $\"\"$ is the length of the wire.

$\"\"$

Volume of the wire is $\"\"$

Find the number of conduction electrons.

Number of conduction electrons is $\"\"$ , where $\"\"$ is the number of free electrons and $\"\"$ is the volume.

The number of free electrons in gold wire is $\"image\"$ per unit volume.

$\"\"$

There are $\"\"$ conduction electrons. \ \