
(a)
The value of mean free path
(a)

Answer to Problem 37P
The value of mean free path
Explanation of Solution
Given:
The resistivity is
The Fermi energy from Table 38-1 is
The value of
Formula used:
The expression of resistivity from equation 38-13 is,
The expression for Fermi speed is,
Calculation:
From equation (1), the mean free path is,
Substitute values in above expression,
Conclusion:
Therefore, the value of mean free path
(b)
The value of scattering cross section area.
(b)

Answer to Problem 37P
The value of scattering cross section area is
Explanation of Solution
Formula used:
The expression for mean free path from equation 38-16 is,
Here,
From equation (3), the scattering cross section area is,
Substitute values in above equation,
Conclusion:
Therefore, the value of scattering cross section area is
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Chapter 38 Solutions
Physics for Scientists and Engineers
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