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JEEMAIN and NEET
>>
Physics
>>
Class12
>>
Current Electricity
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Q)
Calculate the mean free path in
C
u
at room temperature
300
K
, if the number density of free electrons is
8.5
×
10
28
/
m
3
and resistivity
r
=
1.7
×
10
−
8
m
h
o
−
m
. Given
k
=
1.38
×
10
−
23
J
/
K
a
n
d
1
A
=
10
−
10
m
(
A
)
25
A
(
B
)
20
A
(
C
)
5
A
(
D
)
30
A
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