The Resistivity of Iron at 20ºC Is 10 $\times$ 10^-8 $\Omega$ · M and the Number of Electrons Per Cubic Centimeter

question 22

Multiple Choice

The resistivity of iron at 20ºC is 10 $\times$ 10^-8 $\Omega$ · m and the number of electrons per cubic centimeter is 17.0 $\times$ 10²².If you take the average speed of the electrons to be equal to their root-mean-square speed (at T = 300 K) of 1.17 $\times$ 10⁵ m/s,it follows that their mean free path, $\lambda$ ,must be

• A)0.245 nm
• B)0.317 nm
• C)0.428 nm
• D)0.556 nm
• E)None of these is correct.

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