Assertion (A): If WF is Fermi energy, v is velocity of electron and m is mass of

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Question
Assertion (A): If W_F is Fermi energy, v is velocity of electron and m is mass of electron, then .
Reason (R): Conductivity of a metal depends on temperature and impurity concentration.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

Correct Answer

Both A and R are true but R is not correct explanation of A

More questions

4. As compared to an ordinary semiconductor diode, a Schottky diode
Options
A. has higher reverse saturation current
B. has higher reverse saturation current and higher cut in voltage
C. has higher reverse saturation current and lower cut in voltage
D. has lower reverse saturation current and lower cut in voltage

6. The total field developed by an antenna array at a distant point is
Options
A. phasor sum of fields produced by individual antennas of the array
B. algebraic sum of fields produced by individual antennas of the array
C. either (a) or (b) depending on type of array
D. neither (a) nor (b)

7. A standard cell of 1.0185 V is used with a slide wire potentiometer. The balance was obtained at 60 cm. When an unknown emf was connected, the balance was obtained at 82 cm. The magnitude of unknown emf is
Options
A. 1.39 V
B. 0.75 V
C. 13.9 V
D. 7.45 V

8. The number of valence electrons in donor impurity are
Options
A. 5
B. 4
C. 3
D. 1

9. Assertion (A): A DIAC has four layers but only two terminals.
Reason (R): A DIAC can conduct in both directions.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

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