Sem 2

Nutshell Physics Sem-IInd Dr.Girish Joshi [email protected]

PHYSICS-II

Nut-shell Physics for FE Sem-II Dr.GIRISH JOSHI [email protected]

Object of presentation: 1.To drill the content/Syllabus in learners mind.

Learn smartly – Score smartly… 2. Be smart (answer) writer 3. Creation of scientific temper in the corresponding branches of an Engg.

What exactly the content? 1. Optics A] Interference B] Diffraction c] Optical fiber 2.LASERS 3.Quantum Mechanics 4.Magnetisem 5.Vacuum Technology 6.Bio-Physics

How is the Nature of Question Paper? Total Marks Theory: 75 Q.1 Compulsory 15 Marks a,b,c,d,e,f,g Solve any four Questions from Q.2 to 7 Average No. of questions expected to attempt: 05 Q.a) Theory b) Application c) Numerical

What is Basic Expectation from the Learner? • Clarity of the Concept- Theory • Sense of Application of theory in science and Technology • Problem solving capability etc…

Applied Science/ Engg.Sci.

Applied physics Connected to Every Branch of Engg.

• Expected Questions on LASERS? *What is LASERS? • What is the requirement of an LASERS? • Explain the terminology of LASERS • Spontaneous absorption? • Spontaneous emission? • Stimulated emission? • Meta-stable state? • Population Inversion? • Active medium?

Basic Principle of Lasers: Absorption

After Excitation

Emission N2 > Spontaneous Stimulated

N1

How Exact Configuration of LASERS? • Basic Requirement for construction of LASERS: 1.Medium- Solid, Liquid, Gas 2.Excitation Agency 3. Active Medium/Resonance cavity

Different types of LASERS: 1. 2. 3. 4.

Nd:YAG LASERS He:Ne LASERS CO2 LASERS Semiconductor LASERS Application of Laser as-Holography

Construction of Hologram-

General Format for Explanation: • • • • • • • •

Principle Medium Excitation agency Active medium Construction Working –with Energy diagram Merits/ demerits Conclusion. Etc…

Interference of light • Either reflection/ refraction through thin film • Path difference = 2 µ t • Newton's ring Experiment and formation of fringes. • Wedge shaped film

Applications Interference of light

•

Determination of wave length of monochromatic source • For finding refractive index of liquid • Determination of R? (refer Expt.No.1) • Anti reflection coating 5.Wedge shaped film –for optical flatness testing

• Must write your answer or modify the content as per the demand of question ? • Optical diagrams and set up must be properly shown • Optical mechanism- Ray optics drawn properly

Diffraction of light:

Diffraction? • Difference between X-ray and Light ray Diffraction? • Grating? Grating element? Theory of grating element? • Applications diffraction of light?

Basic condition for Diffraction • Path diff.= nλ = {a+b}sinθ • N {a+b}= 1, • N = 1/{a+b}

What is the max. no. of order [n]: nλ = {a+b}sinθ n = {a+b}sinθ/λ Where, sinθ = 900 n = {a+b}/λ

Dispersion power of grating: {a+b}sinθ = nλ 1.nλ Differnceating above equation w.r.t. λ {a+b} cosθ dθ = n dλ [dθ /dλ]= n/{a+b} cosθ Applications of Diffraction of light rays?

Optical fiber? Principle? • • • • • • • •

Construction? Principle? Types of fibers? Materials? Advantages over conventional system? How it is used for communication? Expression of Numerical Aperture? Problems on V-Number, Losses etc…

Quantum Mechanics? • Discuss the Dual nature of matter? give the deBroglie wave length? • Expression of matter wave in the different form? • State and explain Heinbergs Uncertainty principle? • Schrödinger wave equation? Time dependent and independent?

Magnetism • Basic classification between Di, Para and Ferro magnetism? • Magnetic Ckts? And problems on the same? • What is mean by ferrites? Classify between soft and hard magnetic materials?

Vacuum Technology • • • • • •

What is mean by Vacuum? What is its Unit? What are the Different ranges of Vacuum? Generation of Vacuum by Rotary Pump Diffusion Pump Vacuum Gauges- Pirani, Penning, Thermocouple • Applications of Vacuum in Thin film, Microelectronics, plasma and nanotechnology…..

Take care??????????? • Don’t be under over confidence • Technical writing is most challenging • Try to understand every question properly answer the same with highest degree of technical reflection. • Wherever possible present the content with diagram and Technical headings and sub heading • Keep the scientific temper in your mind.

WISH YOU ALL THE BEST !!!

Interference Optical Mechanism due to Path Difference (P.D.)? Importance of P.D.? Newton's Ring Experiment? Formation of ring’s? Applications of N.R.? Problems on the applications? Wedge shaped film? Expression for finding out the thickness of thin object? Problems?

Diffraction? • Difference between X-ray and Light ray Diffraction? • Grating? Grating element? Theory of grating element? • Applications diffraction of light?

Optical fiber • What is mean by optical fiber? Basic principle? Construction? Types? Advantages? • What is Numerical Aperture of an optical fiber? Derive an expression for the same? • Problems on N.A./ Calculation of Vnumber? • Applications of optical fiber for communication?

Quantum Mechanics? • Discuss the Dual nature of matter? give the deBroglie wave length? • Expression of matter wave in the different form? • State and explain Heinbergs Uncertainty principle? • Schrödinger wave equation? Time dependent and independent?

Magnetism • Basic classification between Di, Para and Ferro magnetism? • Magnetic Ckts? And problems on the same? • What is mean by ferrites? Classify between soft and hard magnetic materials?

Vacuum Technology • • • • •

Generation of vacuum ? Rotary (oil) pump and Diffusion pump? Vacuum gauges Pirani, penning and thermocouple? Applications of vacuum in Thin film, microelectronics, plasma physics and nanotechnology?

Bio physics