BSc Physics SEM I ATKT PHYSICS PAPER II Question Paper - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indicate full marks

1. Q2 A) Attempt ANY ONE. 8 marks
   • (i) In case of successive disintegration. of radioactive substance (A—B-C), if number of daughter nuclei (B) given by; Then obtain number of atoms of stable granddaughter (C)
   • (ii) | Define and explain mass defect and binding energy. Using graph, explain the variation of binding energy per nucleon with mass
   • B) Attempt ANY ONE. 8
   • (i) Explain Rutherford’s alpha scattering experiment to determine the size of a nucleus
   • (ii) State the radioactive Explain the phenomenon of carbon dating
   • C) Attempt ANY ONE. 4
   • (i) the minimum energy in MeV needed to break helium into free neutron and proton. Masses in amu are, 1.007825, M(n) = 1.008665, M(He) = 4.002603
   • (ii) If asample of radium has half-life time of the order of 22 years, find the time taken by a sample to decrease to 10%
2. Q3 A) Attempt ANY ONE 8 marks
   • (i) Explain construction and working of a GM counter
   • (ii) Derive an expression for the nuclear disintegration energy
   • B) Attempt ANY ONE 8
   • (i) Derive an expression for Geiger rule i.e. = CR where V,_ is initial velocity of the emitted particle and R is the range of the particle and C is a constant for the particular medium in which the range is defined
   • (ii). Derive the solution of the Q-equation where, E,,E, denote the kinetic energies of the ejectile and projectile respectively, my,m, denote the masses of the ejectile and projectile respectively, My is the mass of the residual nucleus and @ is the angle between the projectile and the ejectile directions
   • C) Attempt ANY ONE 4
   • (i) beam is incident on a stationary target of The reaction F1?(n, has a Q-value of -3.9MeV. Calculate the lowest neutron energy that will make this reaction possible Assume that the masses of the nuclei are equal to their atomic mass number expressed in “amu”
   • (ii) Calculate the amount of energy released when 238 gm_ of Given that Avogadro’s number is 6.023 x and the energy released when one atom of is 200MeV
3. Q4 A) Attempt ANY ONE 8 marks
   • (i) | What is Compton effect? Derive an expression for Compton shift
   • (ii) With the help of Davisson Germer’s experiment show the confirmations of the de Broglie hypothesis of matter waves
   • B) Attempt ANY ONE 8
   • (i) State and explain Heisenberg’s Uncertainty Principle. Hence, show that an electron cannot exist in the nucleus
   • (ii) Explain in detail the production of X-rays
   • C) Attempt ANY ONE 4
   • (i) A black body emits maximum energy at wavelength m when the temperature of black body is If its temperature is increased to calculate the wavelength at which the maximum energy will be emitted
   • (ii) | Using Uncertainty Principle, calculate the uncertainty in position of an electron, moving with 0.005% accuracy along x-axis with a
4. Q5 Attempt ANY FOUR. 20 marks
   • (i) Explain secular radioactive equilibrium
   • (ii) Define packing fraction. Explain the features of packing fraction as a function of mass number
   • (iii) a note on nuclear fission and nuclear fusion
   • (iv), Explain construction of ionization chamber with neat labelled
   • (v) In Compton scattering experiment, X-rays of wavelength 3 are scattered at angle with respect to the incident beam. Calculate the wavelength of scattered rays. Given: = 0.024 x
   • (vi) What are matter waves? Give any four characteristics of matter

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