BS-VS/11
229046
229046
PHYSICS
Course No. : 501
Time Allowed-3 Hours Maximum Marks-80
Note: Attempt five questions, selecting one from each Unit.
Unit-I
1. (i) What is Compton Effect? Show that wavelength of a scattered photon from a free electron is independent of the wavelength of incident radiation. (12)
(ii) Illustrate Heisenberg’s uncertainty principle in case of diffraction of an electron beam from a single slit. (04)
2. (i) What was the need of differential wave equation? Obtain time-dependent Schrodinger’s wave equation for a particle subjected to force. (10)
(ii) A particle is described by a wave function
Unit-II
3. Derive an expression for reflection and transmission coefficient of a particle through a rectangular potential barrier of width ‘a’ and energy less than barrier height. (16)
4. (i) Write down Schrodinger's equation for the hydrogen atom in spherical polar coordinates and separate it into three independent equations. (12)
(ii) Calculate the ground state energy for an electron in a one-dimensional box of length 3Ã…. (04)
Unit-III
5. Discuss quantum mechanical theory of anomalous Zeeman effect and explain the splitting of D1, D2 – lines of the sodium atom. (16)
6. (i) State and explain Bohr’s correspondence principle. (10)
(ii) Discuss space quantisation of orbital angular momentum. (06)
Unit-IV
7. Derive and discuss each term in Weizsacker’s semi-empirical mass formula. (16)
8. (i) What is X-decay? Discuss the discrete nature of X-particle energies. (12)
(ii) After how many days 1 percent of radon will be left behind if its half-life is 3.8 days. (04)
Unit-V
9. Describe principle, construction, and working of G.M. counter. Explain the self-quenching action of G.M. counter. (16)
10. (i) Discuss strong, weak and electromagnetic forces. (08)
(ii) Discuss the concept of Baryon Number and Isospin. (08)
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