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25th September 2014, 03:22 PM
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Join Date: Apr 2013
Re: Anna University MSc Physics Question Paper

Here is the list of few questions of Anna University MSc Physics exam which you are looking for .

1. In a crystalline solid, the energy band structure (E-k relation) for an electron of mass m is given bymkkE2)32(2−=h. The effective mass of the electron in the crystal is (A) m (B) m32 (C) 2m (D) m2

2. Two electric dipoles P1 and P2 are placed at (0, 0, 0) and (1, 0, 0) respectively, with both of them pointing in the +z direction. Without changing the orientations of the dipoles, P2 is moved to (0, 2, 0). The ratio of the electrostatic potential energy of the dipoles after moving to that before moving is (A) 161 (B) 21 (C) 41 (D) 81 2

3. A resistor of 1 kΩ and an inductor of 5 mH are connected in series with a battery of emf 4 V through a switch. The switch is closed at time t = 0. In the following, you may use . 203≈e (a) Find the current flowing in the circuit at t = 15 micro-second. [9] (b) Find the heat dissipated through the resistor during the first 15 micro-second. [12]

4. A photon of energy Eph collides with an electron at rest and gets scattered at an angle 60° with respect to the direction of the incident photon. The ratio of the relativistic kinetic energy T of the recoiled electron and the incident photon energy Eph is 0.05. (a) Determine the wavelength of the incident photon in terms of the Compton wavelength =cmhecλ, where h, me, c are Planck’s constant, electron rest mass and velocity of light respectively. [12] (b) What is the total energy Ee of the recoiled electron in units of its rest mass ? [9]

5. A particle moves in a plane with velocity θθˆˆvrvvr+=r such that θvvr43=. The time dependence of the magnitude of the velocity |vr| = 5t. It is given that r = 1, θ = 0 and at t = 0. (In the following, you may use .) 0>rv203≈e (a) Determine the trajectory r(θ ) of the particle. [9] (b) At what time will θ become 4 radian? [12]

6. A body of mass 1 kg moves under the influence of a central force, with a potential energy function 25)2/3exp()(rrrV−−= Joule, where r is in meters. It is found to move in a circular orbit of radius r = 2 m. (In the following, you may use ).

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