Fundamentals of Nanoscience - I Internal Test

Part A - 5 x 2 = 10

  1. List out various morphologies of 1D Nano Structures.
  2. Why nanomaterial .properties are different from the bulk.
  3. Write not on effect of size reduction on melting point.
  4. List out effects of size reduction on magnetic properties of materials.
  5. Give any two applications of nanocomposites.

Part B - 2 x 5 = 10

  1. Briefly describe various types and morphologies of nanomaterials.
  2. Write note on Quantum Dots.

Part C - 2 x 10 = 20

  1. Write an essay on effect of size reduction on material properties.
  2. Describe various nano synthesis methods. .

Atomic And Nuclear Physics - I st Internal Test

Part A - 5 x 2 = 10

  1. Define critical potential.
  2. State any three properties of positive rays.
  3. Write Einstein photo electric equation.
  4. State laws of photoelectric effect.
  5. Give the principle of mass spectrograph.
Part B - 2 x 5 = 10

  1. Describe Bainbridge Mass Spectrograph.
  2. Explain Lenard experiment to determine e/m of photoelectrons.

Part C - 2 x 10 = 20

  1. Describe the working of Aston mass spectrograph.
  2. Describe Millikan experiment to verify Einstein photoelectric equation.


Fundamentals of Nanoscience - 4BPHE3C - Syllabus

III YEAR – VI SEMESTER
COURSE CODE: 4BPHE3C
ELECTIVE COURSE III (C) – FUNDAMENTALS OF NANOSCIENCE

Unit I              Introduction

Introduction to Nanotechnology – Background and definition of Nanotechnology – Nano materials – Size Dependence.
Types: Nanowires, Nanotubes, Quantum Dots, Nanocomposites – Properties – Ideas about Nano materials synthesis.

Unit II             Carbon Nano Tubes (CNT)

Introduction to CNT – SWNT – MWNT – Properties. CNT based Nano objects- Applications.

Unit III           Fabrication

Fabrication methods – Top down processes – Milling, lithographics, Machining process. Bottom–Up process – MBE and MOVPE, liquid phase methods, colloidal and sol – gel methods – Self Assembly

Unit IV           Characterization

Scanning Probe Microscopy – Principle of operation – Instrumentation – Scanning Tunneling Microscopy – STM probe construction and measurement. 
Atomic Force Microscopy – Instrumentation and Analysis – Tunneling Electron Microscopy– operation and measurement

Unit V             Nano devices and Applications
             
Optical memories, Nano materials applications in magnetism – in electronics. Sensors – in Biomedical field – in optics – Nano layer applications – Nano particle applications
Reference

1.        Hand book of Nanotechnology – Bharat Bhushan.
2.        Nano technology and Nano electronics – W. R. Fahrner (Editor).
3.        Materials Science – P. Mani, G. Ranganath, R. N. Jayaprakash.
4.        Nanotechnology – Mark Ratner, Daniel Ratner.
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Atomic and Nuclear Physics - 4BPH4C1 - Syllabus


II YEAR – IV SEMESTER
COURSE CODE: 4BPH4C1
CORE COURSE VIII – ATOMIC AND NUCLEAR PHYSICS


Unit I                     POSITIVE RAYS
Properties of positive rays – e/m of positive rays – Aston’s, Bainbridge’s mass spectrograph-  critical potential – experimental determination of critical potential –Davis and Goucher‘s experiment.

Photo electricity: Photoelectric emission – laws – Lenard’s experiment – Richardson and Compton experiment – Einstein’s photo electric equation – experimental verification of Einstein’s photo electric equation by Millikan’s experiment – Photoelectric cells.

Unit II                   VECTOR ATOM MODEL
Various quantum numbers – L – S and j – j Couplings – Pauli’s exclusion principle – electronic configuration of elements and periodic classification – magnetic dipole moment of electron due to orbital and spin motion – Bohr magnetron – spatial quantization – Stern and Gerlach experiment.

Fine structure of spectral lines- Spectral terms and notation – selection rules – intensity rule and interval rule – Fine structure of sodium D lines – Alkali spectra – fine structure of alkali spectra – Spectrum of Helium – Zeeman effect – Larmour’s theorem – Debye’s explanation of the normal Zeeman effect – Anomalous Zeeman effect .

Unit III  X – RAYS
Discovery – Production, Properties and absorption of X – rays – origin & analysis of continuous and characteristic X – ray spectrum – Duane & Hunt Law – Bragg’s law – derivation of Bragg’s law – Bragg’s X–ray spectrometer – details of Laue, rotating crystal and powder methods- Mosley’s law and its importance -  Compton effect – Derivation of expression for change in wavelength – its experimental verification.
X – ray crystallography- Definition of  Crystal – Crystal lattice – unit cell –– Bravai’s lattice – Miller indices – illustrations - Structure of KCl crystals.


Unit IV  RADIO ACTIVITY
Natural radioactivity – Laws of disintegration – half life and mean life period – Units of radioactivity – Transient and secular equilibrium – Radio carbon dating – Age of earth – Alpha rays– characteristics – Geiger–Nuttal law – α – ray spectra – Gamow’s theory of α – decay (qualitative study) Beta rays – characteristics.

Beta ray spectra – Neutrino hypothesis - Gamma rays and internal conversion– Nuclear isomerism- artificial radioactivity- Betatron – GM counter –– Cloud chamber

Unit V                   NUCLEAR REACTION
Nuclear fission – chain reaction – four factor formula – critical mass and size – controlled chain reaction – nuclear reactor – Breeder reactor – Transuranic elements – Nuclear fusion – thermonuclear reaction – sources of stellar energy- Cosmic rays (outlines only).

Elementary Particles – Hadrons – leptons – Mesons – Baryons – Hyperons – Antiparticle and antimatter – classification of elementary particles – strangeness – Isospin – conservation laws of symmetry – Basic ideas about quarks – Quark model.

Books for Study
1. Modern Physics                                  –              R.Murugeshan , S.Chand &Co; NewDelhi, 13th    Edition 2008.

2. Modern Physics                                   –              Sehgal & Chopra; Sultan Chand and publication,  9th Edition 2013.

3. Introduction to Modern Physics         –             H.S Mani, G K Mehta, Affiliated east – West  Pvt Ltd, NewDelhi

4. Nuclear Physics                                  –              D.C Tayal , Himalaya Pub.house, Mumbai, V  Edition 2008.

5. Atomic Physics                                   –              J.B Rajam, S.Chand & Co;NewDelhi.

6. Atomic & Nuclear Physics               –              Subramanyam & Brijal, S.Chand & Co; New Delhi, V Edition 2003.



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Standardization of Meter - Application of Michelson Interferometer

 
Please visit the following Link for the study material :


 http://vle.du.ac.in/mod/book/view.php?id=13289&chapterid=29232

Triangular Wave Generator Using Op-Amps

A triangular wave generator using op-amps can be realized by cascading the output of an op-amp square wave generator to the input of an active integrator. Such an implementation is shown in the following circuit diagram. 

Triangular Wave Generator

Working and Circuit Analysis


Here the first op-amp is wired up as a  comparator at the non-inverting input. If V+ is greater than V- then the output voltage V' will swing to +Vcc and to -Vcc if V+ is less than V- . When the circuit is switched on assume the output voltage is +Vcc and the capacitor C begins charging through the feedback resistor R with the time constant RC. As a result V-   increases with time and when it becomes greater than V+ the output voltage swings to the negative rail voltage -Vcc. Now the capacitor is is discharged through R. When the voltage becomes less than -Vcc the output voltage swings back to +Vcc and the cycle begins again generating square wave. 

 The output of square wave generator V' is fed into the inverting input of second op-amp wired as an active integrator through the resistance R3  . 

A triangular wave is generated when a capacitor is charged and discharged by a constant current source. Let V' be hight at +Vcc. This causes a constant current +Vcc/R3 through C in the integrator part to drive Vout negative linearly. When V' is low at -Vcc it forces a constant current  -Vcc/R3  through  C to drive Vout positive linearly. The frequency of the triangular wave is same as that of square wave and given by, 

for the special case R1 =  R2.


ANALOG ELECTRONICS PRIOR UNIVERSITY QUESTIONS













Square Wave Generator Using Op-Amp




A square wave generator's output oscillates between two unstable states with a constant frequency prescribed by the circuit parameters. An op-amp implementation of square wave generator is shown in the following circuit diagram. 

Working and Circuit Analysis


Square Wave Generator Using Op-Amp


Here the op-amp is wired up as a  comparator at the non-inverting input. If V+ is greater than V- then the output voltage Vout will swing to +Vcc and to -Vcc if V+ is less than V- . When the circuit is switched on assume the output voltage is +Vcc and the capacitor C begins charging through the feedback resistor R with the time constant RC. As a result V-   increases with time and when it becomes greater than V+ the output voltage swings to the negative rail voltage -Vcc. Now the capacitor is is discharged through R. When the voltage becomes less than -Vcc the output voltage swings back to +Vcc and the cycle begins again generating square wave. The capacitor charging and discharging cycles and output waveforms are sketched below:
Square Wave Generator Waveforms


Voltage at the non-inverting input is  given by the divider equation:


As the output voltage swings between +Vcc  and -Vcc , V+  swings between 


and


If R1 and R2 are equal, the frequency of oscillation will be given by,

OPTICS AND SPECTROSCOPY PRIOR UNIVERSITY QUESTIONS

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OPTICS AND SPECTROSCOPY- 4BPH3C1 QUESTION BANK

OPTICS AND SPECTROSCOPY- 4BPH3C1


PART – A

1. Distinguish between Ramsden eyepiece and Huygens eyepiece.
2. Write short note on chromatic aberration in lenses.
3. Give three methods of minimizing spherical aberration.
4. Define dispersive power of a prism.
5. What is an achromatic doublet?
6. How chromatic aberration is minimized in the case of Huygens and Ramsden eyepieces.
7. Explain briefly about coma.
8. Explain the construction of Ramsden eyepiece with a suitable diagram.
9. Explain the construction of Huygens eyepiece with a suitable diagram.
10. What is an air wedge? State its uses.
11. Give the principle of Jamin interferometer.
12. State Stoke’s law.
13. Explain appearance of colors in thin films.
14. State the uses of Michelson interferometer.
15. Define resolving power .state Rayleigh criterion for resolution.
16. Define resolving power of a grating.
17. Define specific rotation or specific rotatory power.
18. What is a quarter wave plate?
19. What is a half wave plate?
20. What is the difference between unpolarized light and polarized light?
20. Write short notes on quarter wave plate.
21. Write short notes on half wave plate.
22. State and explain Malus law.
23. Write a note on FTIR.
24. Define Spectroscopy.
25. What is Anti-Stokes line?
26.Give the Application of vibrational Raman spectra.
27. What is a selection rule?
28.Expand FTIR.

PART – B

1. Derive the condition for minimization of spherical aberration when two thin lenses are separated        by a distance.
2. What is an achromatic doublet? Explain in detail.
3. Explain the working of Huygens eyepiece.
4. Write note on Ramsden eyepiece.
5. Explain the construction and working of a direct vision spectroscope.
6. Describe the effect of interference in reflected light from thin films.
7. Explain how colors appear in thin films due to interference.
8. Describe the experiment to find diameter of a thin wire by air wedge method.
9. Explain the principle and working of Jamin interferometer for determining the refractive index of        gas.
10. Explain how Jamin interferometer is used to study the refractive index of a gas at different                  pressures.
11. Distinguish between Fresnel diffraction and Fraunhofer diffraction.
12. Show that the radii of half period zones are in the ratio of square roots of natural numbers.
13. Explain Fresnel diffraction of light at a circular aperture.
14. Explain Fraunhofer diffraction of light at a single slit.
15. Discuss the Fraunhofer diffraction pattern due to a single slit.
16. Derive an expression for the resolving power of a grating.
17 .Give the Huygens explanation of double refraction in a uni-axial crystal.
18. Give the theory of half wave plate.
19. Give the theory of quarter wave plate.
20. Write note on Microwave and Raman spectroscopy.
21. Explain classical theory of Raman effect.
22. Explain vibrational Raman spectra.
23. Discuss Rotational spectra of diatomic molecules. Give its selection rule.
25. Explain Microwave and Infrared spectroscopy.
26. Explain pure rotational Raman spectrum of linear molecules.


PART – C

1. Define angular dispersion and dispersive power. Derive the conditions to produce (i) dispersion without deviation and (ii) deviation without dispersion in combination of prisms.
2. Derive the condition for achromatism in lenses (i) When they are in contact (ii) When they are separated by a distance ‘a’.
3. What is meant by spherical aberration in lenses?  What are the ways to remove spherical aberration?
4. Explain the construction, action and working of a Ramsden eyepiece and Huygens eye piece with neat diagrams. Indicate in a diagram the position of cardinal points for these two eyepieces. How are the chromatic and spherical aberration minimized in these eyepieces?
5. Describe with necessary theory the Newton’s ring experiment for the determination of refractive index of a liquid.
6. Explain the working of Michelson interferometer. How the wavelength of monochromatic light can be measured?
7. Derive the expression for the radius of mth ring formed in Newton’s ring experiment and hence determine the refractive index of a liquid.
8. Describe Michelson interferometer and explain the formation of fringes in it. How was the instrument used for the standardization of meter?
9. Explain with theory how the wavelength of the light can be determined using diffraction grating by oblique incidence method.
10. Give the theory of plane transmission grating. Describe an experiment to determine the wavelength of sodium light.
11. Define specific rotation and explain Fresnel theory of optical rotation.
12. Describe Laurent’s half shade polarimeter and explain how specific rotary power is determined.
13. Explain the production and the analysis of circularly and elliptically polarized light.
14.   Explain how elliptically and circularly polarized light can be produced and analyzed.
15.   Explain the production and detection of plane, circularly and elliptically polarized light.
16.   Give the theory of production of circularly and elliptically polarized light.
17.   Explain Quantum theory of Raman effect.




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