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20. (a) The ideal gas law in the form of Eq. 209 leads to
p = NkT
/
V = n
0
kT
. Thus, we
solve for the molecules per cubic meter:
5
25
3
0
23
(1.0atm)(1.0 10 Pa/atm)
2.7 10 m
.
(1.38 10
J/K)(273K)
p
n
kT
−
−
×
==
=×
×
(b) Combining Eqs. 412, 413 and 414 leads to the conduction electrons per cubic meter
in copper:
33
28
3
27
8.96 10 kg/m
8.43 10 m
.
(63.54)(1.67 10
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This note was uploaded on 05/19/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics

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