Anna University Regulation 2013 Information Technology (IT) PH6251 PHY2 Important Questions for all 5 units are provided below. Download link for IT 2nd SEM PH6251 Engineering Physics 2 Answer Key is listed down for students to make perfect utilization and score maximum marks with our study materials.

**DEPARTMENT OF PHYSICS **

**Academic Year: 2015-16 **

**QUESTION BANK – EVEN SEMESTER **

**PH6251 – ENGINEERING PHYSICS -II **

**UNIT 1 – CONDUCTING MATERIALS **

PART –A

1. Give any three postulates of classical free electron theory.

2 Define drift velocity. How is it different from thermal velocity of an electron?

3 Define the terms relaxation time, collision time and Mean free path of an electron.

4 Define Electrical resistivity. Write its unit.

5 The mobility of electron in copper is 3×10-3 m2 /Vs. Assuming e = 1.6×10-19C and me= 9.1×10-31 kg, calculate the Mean free time.

6 Differentiate between electrical conductivity and thermal conductivity.

7 Mention the drawbacks of classical free electron theory of metals.

8 What are the merits of classical free electron theory of metals.

9 Find the drift velocity of electrons copper wire whose cross sectional area is 1 mm2 . When the wire carries a current of 10 A. Assume that each copper atom contributes one electron of the electron gas. Given n = 8.5×1028 /m3

10 A conducting rod contains 8.5×1028 electrons per m3 . Calculate the electrical conductivity at room temperature if the collision time for electron is 2 X 10-14 s.

11 State any three assumptions of quantum free electron theory.

12 What are the merits and demerits of quantum free electron theory?

13 Define Fermi level and Fermi Energy with its importance.

14 Write down the expression for Fermi-Dirac distribution function and plot it as a function of energy.

15 Calculate the Fermi energy of copper at 0° K if the concentration of electrons is 8.5×1028 m-3

16 Why we have energy bands in solids and energy levels in gases.

17 Define Lorentz number

18 The thermal conductivity of a metal is 123.92 W/m/k . Find the electrical conductivity and Lorentz number when the metal possess relaxation time 10-14 seconds and 300 K.(Density of electrons = 6 x 1028 /m3 ).

19 The Fermi temperature of a metal is 24600 K. Calculate the Fermi velocity.

20 The Fermi level for potassium is 2.1eV. calculate the velocity of electrons at the Fermi level.

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