Applied physics engineering Lec 1.1.pptx

Physics

1. Applied Physics PHM181 Dr. Zeeshan ( Lecturer ) Department of Physics and Computer Science DAYALBAGH EDUCATIONAL INSTITUTE

2. “ When you can measure what you are speaking about, and express it in numbers, you know something about it.” Lord Kelvin Physical quantities Control

3. Fundamental Physical Quantities 1. Length ( m ) 🗸

4. Fundamental Physical Quantities 1. Length ( m ) 🗸 2. Mass ( kg ) 🗸

5. Fundamental Physical Quantities 1. Length ( m ) 🗸 2. Mass ( kg ) 🗸 3. Time ( s ) 🗸

6. Fundamental Physical Quantities 1. Length ( m ) 🗸 2. Mass ( kg ) 🗸 3. Time ( s ) 🗸

7. Fundamental Physical Quantities 1. Length ( m ) 🗸 2. Mass ( kg ) 🗸 3. Time ( s ) 🗸 4. Electric Current ( A ) 🗸

8. Fundamental Physical Quantities 1. Length ( m ) 🗸 2. Mass ( kg ) 🗸 3. Time ( s ) 🗸 4. Electric Current ( A ) 🗸 5. Temperature ( K ) 🗸

9. Fundamental Physical Quantities 1. Length ( m ) 🗸 2. Mass ( kg ) 🗸 3. Time ( s ) 🗸 4. Electric Current ( A ) 🗸 5. Temperature ( K ) 🗸 6. Luminous Intensity ( Cd ) 🗸

10. Fundamental Physical Quantities 1. Length ( m ) 🗸 2. Mass ( kg ) 🗸 3. Time ( s ) 🗸 4. Electric Current ( A ) 🗸 5. Temperature ( K ) 🗸 6. Luminous Intensity ( Cd ) 🗸 7. Amount of Substance ( Mole ) 🗸 🗸 12.0 g 24.3 g 63.5 g Carbon Magnesium Copper No. of Particles 6.02 ✕ 10 23

11. Communication Technology Space and Astrophysics Clinical and Medical Material Science Application Areas

12. Syllabus 5 Electromagnetic Theory 6 Lasers & Fiber Optics 1 Wave Motion 4 Polarisation 2 Interference 3 Diffraction

13. Prerequisite Target Audience Physics at 10+2 Level. Undergraduate students of Science and Engineering stream. Diploma and Polytechnic students. Students preparing for NET / GATE exams. Physics admirers who wish to brush up the concepts.

14. UNIT 1: WAVE MOTION One dimensional waves, harmonic waves, phase and phase velocity, the superposition principle, the complex representation, phasors and the addition of waves, plane waves, the addition of waves of the same frequency, the addition of waves of different frequency. Acoustics: sound waves, intensity of sound waves, decibels and Weber-Fechner law; characteristics of a musical sound versus noise.

15. UNIT 2: ELECTROMAGNETIC THEORY Basic laws of electromagnetic theory – Maxwell’s equations, electromagnetic waves, energy and momentum in electromagnetic waves, the electromagnetic-photon spectrum, Rayleigh scattering, reflection, refraction, Fermat's principle, total internal reflection

16. UNIT 3: INTERFERENCE AND DIFFRACTION Conditions for interference, W avefront-splitting interferometers, amplitude-splitting interferometers, types and localization of interference fringes, Fraunhofer diffraction, Fresnel diffraction.

17. UNIT 4: POLARIZATION The nature of polarized light, polarizers, dichroism, birefringence, scattering and polarization, polarization by reflection, retarders, circular polarizers, polarizations of polychromatic light, optical activity.

18. UNIT 5: LASER AND FIBER OPTICS Radiant energy and matter in equilibrium, Stefan-Boltzmann law, Wien displacement law, Planck’s radiation law, the Einstein A and B coefficients, Ruby laser, Helium-neon laser, semiconductor laser, fiber optics, numerical aperture, types of fiber, fiber optic communication.

19. Suggested Reading

20. What is light? “Is light a wave phenomenon or a particle phenomenon?”

21. Particle The essential feature of a particle is its localization; It exists in a well-defined, “small” region of space. Practically, we tend to take something familiar like a ball or a pebble and shrink it down in imagination until it becomes vanishingly small. Wave The essential feature of a wave is its non-localization. A classical traveling wave is a self-sustaining disturbance of a medium, which moves through space transporting energy and momentum.

22. Traveling Waves Traveling wave is a self-sustaining disturbance of the medium through which it propagates The most familiar waves, and the easiest to visualize are the mechanical waves. For example, waves on strings, surface waves on liquids, sound waves in the air, and compression waves in both solids and fluids.

23. Longitudinal and Transverse Waves Sound waves are longitudinal — the medium is displaced in the direction of motion of the wave . Waves on a string (and electromagnetic waves) are transverse — the medium is displaced in a direction perpendicular to that of the motion of the wave . ……… NOTE: In all cases, although the energy-carrying disturbance advances through the medium, the individual participating atoms remain in the vicinity of their equilibrium positions: the disturbance advances , not the material medium .

24. Some Questions

25. What about water waves and Earthquakes? Transverse / Longitudinal????? https://www.acs.psu.edu/drussell/Demos/waves/wavemotion.html

26. What about water waves and Earthquakes? Transverse / Longitudinal????? https://www.acs.psu.edu/drussell/Demos/waves/wavemotion.html

27. https://www.acs.psu.edu/drussell/Demos/waves/wavemotion.html

28. https://www.acs.psu.edu/drussell/Demos/waves/wavemotion.html

29. https://www.acs.psu.edu/drussell/Demos/waves/wavemotion.html

30. Ph.D. in Physics from DEI, Agra and Michigan State University, USA Masters of Physics (Director's Medal) with specialization in Electronics & B.Sc. Physics Honors (Director's Medal) from Dayalbagh Educational Institute, Agra Research interests : Electronics, Bio-sensing, Plasma and Microwave physics. Research Publications: 6 Journals, 12 Conferences, 2 Patents Professional Achievements : UGC-NET (Electronic Science)-2017, 2018, 2019, 2020, 2021 UGC-NET (JRF)-2020, 2021 GATE-(Electronics and Communication Engineering)-2019 Fellowships Selected for- JRF in DST-INSPIRE, DRDO and UGC. Guest Lecturer in B. Voc. Telematics (DEI, Agra)-Feb-Oct, 2019. Winner Global Innovation Challenge –GARD 2021, 2022 E-Mail: [email protected] Teaching Assignments Even Semester: Applied Physics-II Electronics-II Electronics Lab Odd Semester: Applied Physics-I Network Theory Microcontrollers Know Your Instructor……. Dr. Zeeshan, Lecturer Dept. Of Physics & Comp Sci. Faculty of Science

31. Thank you!