Not yet checked 1 of 7 questions have not yet been compared with the official paper.
Part II
Q. 2
(a)Consider an infinitely long cylindrical insulating shell of inner radius a, and outer radius b, and has a uniform volume charge density ρ. If a line of charge density λ is placed along the axis of the shell then determine the electric field intensity at a point r such that (i) a < r < b and (ii) r > b. [8]
(b)Determine the energy density for a capacitor. [6]
(c)Discuss the Lorentz force. [6]
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Q. 3
(a)Find the magnetic energy density for the magnetic field of the inductor. [10]
(b)Sate and explain the Lenz’s law. [6]
(c)Why is the work done by a magnetic field on a charged particle always zero? [4]
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Q. 4
(a)Describe the properties of each of, an electron and the light, that show their dual nature. [8]
(b)State and explain the de Broglie hypothesis? [6]
(c)Metals A, B and C have work functions 2.2eV, 3.6eV and 4.8eV. If a light of wavelength 320nm is incident on these, then find: Which metals exhibit photoelectric effect? Maximum kinetic energy of photoelectron in each case? [6]
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Q. 5
(a)Determine the transmission co-efficient for a particle having energy E incident on a rectangular barrier, so that E < E<V0 , the barrier is given by: V ( x ) = V(x)=V0 for −a<x<a and V(x)=0 for ∣ x ∣ > a |x| > a ∣ x ∣ > a . [14]
(b)For an operator ^ \hat{A} ^ , we know [ A ^ , H ^ ] = 0 [\hat{A}, \hat{H}] = 0 [ A ^ , H ^ ] = 0 , where ^ \hat{H} ^ is the Hamiltonian operator, what can we conclude about the eigen states of ^ \hat{A} ^ and the ⟨ A ^ ⟩ \langle\hat{A}\rangle ⟨ A ^ ⟩ ? [4]
(c)Give two examples for the operator ^ \hat{A} ^ , given in part (b) above. [2]
Not yet checked
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Q. 6
(a)Describe the electrical conduction in different types of solids in terms of band theory. [8]
(b)Explain the crystal structure of diamond. [6]
(c)Find the carrier concentration of electrons in Silicon at a temperature of 25°C. [6]
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Q. 7
(a)What factors contribute to the stability of a nucleus? Draw and explain the plot of neutron number N versus atomic number Z for stable nuclei. [10]
(b)Explain the use of chain reaction in relation to a nuclear reactor. [6]
(c)The stable isotope of potassium is 19K, what kind of radioactivity do you expect from 18K? Give reasons. [4]
The 2021 CSS Physics paper set by the FPSC. Question wording only; questions marked “Not yet checked” have not been compared with the official paper yet.
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