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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 2
46.

Assertion (A): Relaxation time and mean time between collisions are equal when scattering is isotropic.

Reason (R): Mean free path of an electron λ, velocity of electron v and mean time between collisions tc are related as λ = vTc.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.

Assertion (A): Copper is a monoatomic solid.

Reason (R): In a metal the valence electrons belong to all atoms.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
The heat developed per m3 per second (W) in a conductor having a conductivity σ and a field E is
W = σE2
W = σE
W =
W = (σE)0.5
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
The number of valence electrons in acceptor impurity are
5
4
3
1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
If q is charge on an electron, R is radius of electron orbit and ω is angular velocity of electron rotation, the magnetic dipole moment of electron in orbit is
0.5 qωR
0.5 q2ω2R2
0.5 qωR2
0.5 qω2R
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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