Not yet checked 3 of 7 questions have not yet been compared with the official paper.
Part II
Q. 2
(a)State and prove Gauss law. Compare it with Coulomb's law for calculating electric field. [4]
(b)Determine the E field caused by a spherical cloud of electrons with a volume charge density ρ=ρ0 for 0 0≤R≤b (both ρ0 and b are positive) and ρ=0 for R > b R > b R > b . Sketch the charge distribution and electric field for this charge. [6]
Not yet checked
(10)
Q. 3
(a)Explain Maxwell's equations. Write the fundamental relations for electrostatic and magnetostatic models. [4]
(b)How these were modified to Maxwell's equations? What is the main contribution of Maxwell in this regard? [6]
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Q. 4
(a)What are P-type and N-type semiconductors? Draw ampere-volt characteristic of a PN junction. [4]
(b)Why there is sudden increase in the small reverse saturation current at the breakdown voltage? Write the uses of zener diode. [6]
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Q. 5
(a)What is Compton Effect? [2]
(b)Derive an expression for Compton shift. [8]
(c)How it depends upon the scattering angle? [4]
(d)What do you mean by Red Shift? [2]
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Q. 6
(a)Describe Schrodinger's wave equation. Normalize Ψ = A e − α x 2 \Psi = Ae^{-\alpha x^2} Ψ = A e − α x 2 , where A and α are real constants, A has units of (length) −1/2 and α with units of (length) −2 . [6]
(b)What is the probability of finding the particle described by this wave function between x = 0.99 x = 0.99 x = 0.99 and x = 1.01 x = 1.01 x = 1.01 units? Also find the possible solution for E and V. [Given the integration from −∞ to +∞ ∫ e − 2 x 2 d x = π / 2 \int e^{-2x^2} dx = \sqrt{\pi/2} ∫ e − 2 x 2 d x = π /2 ] [4]
Not yet checked
(10)
Q. 7
(a)Explain Radioactive decay. Find an expression for decay rate. Relate half life to the disintegration constant. [4]
(b)What are the units for the measurement of radioactivity? [2]
(c)A 2.71g sample of radioactive KCl is decaying at a constant rate of 440 Bq into the isotope 40 K, which constitutes 1.17% of the normal potassium. Calculate the half-life of this nuclide. [6]
The 2009 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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