If v is the velocity of electron, tc is the average time between collisions, the

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Question
If v is the velocity of electron, t_c is the average time between collisions, the mean free path ? = vt_c.
Options
A. True
B. False

Correct Answer

True

Materials and Components problems

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4. The transition of electron from energy level W₁ to W₂ is associated with emission or absorption of electro magnetic radiation of frequency f such that
Options
A. hf = |W₁ - W₂|
B. |W₁ - W₂|f = h
C. hf = 0.5|W₁ - W₂|
D. (hf)² = |W₁ - W₂|

7. The orientation polarization is
1. directly proportional to temperature
2. inversely proportional to temperature
3. inversely proportional to square of permanent dipole moment
4. directly proportional to square of permanent dipole moment.
Which of the above are correct?
Options
A. 1 and 3 only
B. 2 and 3 only
C. 1 and 4 only
D. 2 and 4 only

9. In carbon resistor colour code, if the third band is of silver, it indicates
Options
A. that three zeros are to be added to indicate the resistance value
B. multiplier is 0.01
C. multiplier is 0.1
D. tolerance is � 5%

10. Assertion (A): Ferromagnetic materials possess ferromagnetic properties only when temperature is less than paramagnetic curie temperature.
Reason (R): For a ferromagnetic material for T > ?_f.
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

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