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JEE MAIN 2019
09-04-2019 S2
Question
In a conductor, if the number of conduction electrons per unit volume is $8.5 \times 10^{28} \mathrm{~m}^{-3}$ and mean free time is 25 fs (femto second), it's approximate resistivity is $$ \left(\mathrm{m}_{\mathrm{e}}=9.1 \times 10^{-31} \mathrm{~kg}\right) $$
Select the correct option:
A
$10^{-5} \Omega \mathrm{~m}$
B
$10^{-6} \Omega \mathrm{~m}$
C
$10^{-7} \Omega \mathrm{~m}$
D
$10^{-8} \Omega \mathrm{~m}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
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Physics
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