1. The document describes an experiment to observe the Faraday effect, where the plane of polarization of light rotates as it passes through a transparent material in a magnetic field.
2. The experiment aims to measure the Verdet constant, which quantifies the Faraday rotation, of dense flint glass at different wavelengths. This tests the classical theory of magnetic circular birefringence.
3. The setup involves an electromagnet, polarized laser light passed through a glass sample in the magnetic field, and measurement of the rotation angle using a photodiode detector and analyzer to test the dependence predicted by Malus' law and Becquerel's formula.
Theoretically investigate the nature of direct band gap of novel materialsUCP
DIRECT BAND GAP:
In the direct band gap band to band recombination and generation occur.
Band to band recombination:
In band-to-band recombination electron from conduction band directly come back to valance band (in valance band holes are present which are the deficiency of electrons which are form when electrons leave valance band and go to conduction band) The electrons and holes annihilate each other the excess energy release during this process in the form of light called photon or in the form of thermal energy.
Band to band recombination is called direct band recombination.
Band to band generation:
In band-to-band generation electron is excited directly from valance band in to the conduction band after absorbing the thermal energy or photon(light) as shown in fig. given bellow.
If the thermal energy is absorbed this process is called thermal generation
If the light is absorbed this process is called photo generation
Momentum consideration in direct band:
In the EK plot K is the parameter proportional to momentum of electron.
GaAs is a notable member of direct band semiconductor
Photons, being massless entities carry the little momentum.
In direct band-band recombination K-value of electron’s and holes are all bounced k=o.as shown in figure given bellow, the little change in momentum is required for the recombination process to proceed.
For conservation of energy and momentum simply the photon is emitted
Energy and momentum have parabolic shape
Theoretically investigate the nature of direct band gap of novel materialsUCP
DIRECT BAND GAP:
In the direct band gap band to band recombination and generation occur.
Band to band recombination:
In band-to-band recombination electron from conduction band directly come back to valance band (in valance band holes are present which are the deficiency of electrons which are form when electrons leave valance band and go to conduction band) The electrons and holes annihilate each other the excess energy release during this process in the form of light called photon or in the form of thermal energy.
Band to band recombination is called direct band recombination.
Band to band generation:
In band-to-band generation electron is excited directly from valance band in to the conduction band after absorbing the thermal energy or photon(light) as shown in fig. given bellow.
If the thermal energy is absorbed this process is called thermal generation
If the light is absorbed this process is called photo generation
Momentum consideration in direct band:
In the EK plot K is the parameter proportional to momentum of electron.
GaAs is a notable member of direct band semiconductor
Photons, being massless entities carry the little momentum.
In direct band-band recombination K-value of electron’s and holes are all bounced k=o.as shown in figure given bellow, the little change in momentum is required for the recombination process to proceed.
For conservation of energy and momentum simply the photon is emitted
Energy and momentum have parabolic shape
ESR is a branch of absorption spectroscopy .
It is absorbed microwave radiation by an unpaired electron when it is exposed to a strong magnetic field.
Species that contain unpaired electrons (transition metal complex, odd-electron molecules can therefore be detected by ESR.
ESR is also known as Electron Paramagnetic Resonance (EPR) or Electron Magnetic Resonance (EMR) .
The above document throws light on the fundamentals of semiconducting materials that includes the formation of bonds, distribution of carriers, p-type and n-type semiconductors, position of Fermi energy in intrinsic and extrinsic semiconductors, direct and indirect bandgap semiconductors and their applications, carrier concentration, the electric conductivity of semiconductors and Hall effect theory and applications.
This article gives a vivid description of the principle and working procedure of a Light Emitting Diode. It provides a comprehensive understanding of how this very important optical device is useful in our daily applications, its types, structure and other related information.
How to find the verdet's constant. This presentation discovers the basic concept behind the experiment of determing the verdet's constant for different substances
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
ESR is a branch of absorption spectroscopy .
It is absorbed microwave radiation by an unpaired electron when it is exposed to a strong magnetic field.
Species that contain unpaired electrons (transition metal complex, odd-electron molecules can therefore be detected by ESR.
ESR is also known as Electron Paramagnetic Resonance (EPR) or Electron Magnetic Resonance (EMR) .
The above document throws light on the fundamentals of semiconducting materials that includes the formation of bonds, distribution of carriers, p-type and n-type semiconductors, position of Fermi energy in intrinsic and extrinsic semiconductors, direct and indirect bandgap semiconductors and their applications, carrier concentration, the electric conductivity of semiconductors and Hall effect theory and applications.
This article gives a vivid description of the principle and working procedure of a Light Emitting Diode. It provides a comprehensive understanding of how this very important optical device is useful in our daily applications, its types, structure and other related information.
How to find the verdet's constant. This presentation discovers the basic concept behind the experiment of determing the verdet's constant for different substances
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
This paper deals with the Internal quantum efficiency of ITO, CdTe, ZnO/a-Si, SnS/Si, CdS /CIGS, FTO/CZTS based of material photodiode with a ITO/CdTe, ZnO/a-Si, SnS/Si, CdS /CIGS, FTO/CZTS heterojunction structure. Along with information on device characteristics, applications and properties, we provide a comparative device analysis between this type of photodiode and the slightly more efficient ITO/CdTe, ZnO/a-Si, SnS/Si, CdS /CIGS, FTO/CZTS heterojunction structure. We will get the clear concept of the relation between of generated current & load voltage. We hope, we will get a clear explanation about the effect of photodiode light intensity & wavelength on the solar efficiency. In this project we will analyze the Quantum efficiency of a photodiode.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
4 radio wave propagation over the earthSolo Hermelin
Describes the Electromagnetic Wave Propagation over the Earth Surface. Please send comments to solo.hermelin@gmail.com.
For more presentations on different subjects pleade visit my website at http://www,solohermelin.com.
This presentation is in the Radar folder.
Advance electronics, semiconductor devices handwritten notes in pdf form
if anybody needs the soft of this book cand contact to me I have also a solution of this book in pdf form my contact no
03201611448
METHOD OF HARDNESS MEASUREMENT:
There are two types of measurement of hardness of a compounds:
• Static indentation
• Rebound testing
STATIC INDENTATION:
• Static indentation involves pressing a ball diamond or other types of indenter under a specified constant load into surface of material and measuring the length width or depth of the indentation.
• The measured indentation size is then converted to a hardness number specified to the scale adopted.
• In general the harder the material the better the resistance and thus the smaller the indentation.
REBOUND TESTING:
• Rebound testing involves dropping an indenter o to the surface of specimen and measuring rebound height of the indenter.
• The potential energy at the initial height is converted to kinetic energy when the indenter is released.
• A fraction of the kinetic energy is consume for plastic deformation on impact living some kinetic energy after impact to convert back to potential energy and achieve a certain rebound height of the indenter.
• The rebound height the measure by the instrument is then converted to a hardness number.
Hard materials are difficult to cut and shape then softer ones. They are also usually more brittle which means that do not bend much but can shatter. Hard material are used in cutting tool machines and other industrial goods. Hardness test are important in material science. The MOHS scale of mineral hardness test the hardness of minerals. The Brinell scale and various compression tests and rebound test are more used for metals and artificial materials
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
1. 1 | P a g e
MAGNETO-OPTICAL FARADAY
ROTATION .
INTRODUCTION :
If any transparent solid or liquid is placed in a uniform magnetic field, and a beam of plane polarized light
is passed through it in the direction parallel to the magnetic lines of force (through holes in the pole shoes
of a strong electromagnet), it is found that the transmitted light is still plane polarized, but that the plane
of polarization is rotated by an angle proportional to the field intensity. This "optical rotation" is called
the Faraday rotation (or Farady effect) and differs in an important respect from a similar effect, called
optical activity, occurring in sugar solutions.
In a sugar solution, the optical rotation proceeds in the same direction, whichever way the light is
directed. In particular, when a beam is reflected back through the solution it emerges with the same
polarization as it entered before reflection. In the Faraday effect, however, the direction of the optical
rotation, as viewed when looking into the beam, is reversed when the light traverses the substance
opposite to the magnetic field direction; that is, the rotation can be reversed by either changing the field
direction or the light direction. Reflected light, having passed twice through the medium, has its plane of
polarization rotated by twice the angle observed for single transmission.
AIM AND OBJECTIVE :
The purpose of this experiment is to observe the effect of a magnetic field on the transmission of linearly
polarized light through a dispersive medium , to measure the Verdet constant of dense flint glass at
several wavelengths, and to test the validity of the classical theory of magnetic circular birefringence,
known as the Faraday Effect.
Test the experimental apparatus. Plot the transmission vs. angle for a rotating analyzer and verify that it
goes a :
I = Io Cos2
∆ 𝜽
2. 2 | P a g e
DISCUSSION OF APPARATUS :
Electromagnet.
Magnet power supply.
50V-5A DC.
32 & 140 V AC.
RU #00048664).
Gauss-meter (RFL Industries).
High Intensity.
Tungsten Filament Lamp.
Three interference filters.
Volt-ammeter (DC).
Nicol prisms (2).
Glass samples (extra dense flint (EDF).
Light flint.
Sample holder (PVC).
HP 6235A Triple output power supply.
HP 34401 Multi-meter.
Si photodiode detector. .
THEORY AND BACKGROUND OF EXPERIMENT :
The relation between the angle of rotation of the polarization and the magnetic field in the transparent
material is given by Becquerel's formula:
= VBd
Where the is the angle of rotation, d is the length of the path where the light and magnetic field interact
(d is the sample thickness for this experiment), B is the magnetic field component in the direction of the
light propagation and V is the Verdet constant for the material (MKS units: radian/Tesla meter). This
empirical proportionality constant varies with wavelength and temperature and is tabulated for various
materials.
The Verdet Constant, V, depends on the dispersion of the refractive index, dn/d where n is the index of
refraction is the wavelength. As shown in the appendix:
V = /dB = -
1
2
𝑒
𝑚
𝜆
𝑐
𝑑𝑙
𝑑𝜆
Here e/m is the charge to mass ratio of the electron and c is the speed of light.
EXPERIMENTAL SETUP :
Set up the Teachspin Faraday Effect system in accordance with the manual (red binder). Then
follow steps (b) – (f) for each of the three lasers (Red, Green, and Blue)
Check if the laser output is polarized. If the laser is not polarized, use an initial Polarizer polaroid
P after the laser to polarize the beam before entering the glass rod
Use solenoid current set to 0 use the photodiode detector to measure the he transmitted light
intensity I as a function of the angular setting of the analyzer polaroid. You should observe a
3. 3 | P a g e
Malus’ Law dependence I = I0cos (θ) where θ is the relative angle between the plane of
polarization of the polarized laser beam and the transmission axis of the analyzer A. This check
of Malus’ law dependence is a good test that your input beam is polarized.
Now measures the angle of rotation of the plane of polarization of the beam. Do not exceed 3
Amps for the solenoid current.
Plot your measured Faraday effect rotation angles ΔΦ vs. the applied magnetic field B.
Compare your measured value of CV for the glass rod with published (handbook) data for similar
types of glass.
Plot CV vs. λ.
CALCULATIONS :
It can be shown that the verdet constant is expected to be :
V = /dB = -
1
2
𝑒
𝑚
𝜆
𝑐
𝑑𝑙
𝑑𝜆
For the normal dispersion :
𝑑𝑛
𝑑𝜆
∝ 1/ λ3
Which means :
V ∝ 1/ λ2
So there should be a large difference between the V’s for red and blue light. Some numerical values of
are tabulated below :
RESULT ANALYSIS :
Magneto-optic effect is a phenomenon in which an electromagnetic wave propagates through a medium
and gets affected by the presence of a quasistatic magnetic field. Verdet constant describes the strength of
Faraday Effect for a particular material. The objective of this work was to measure the Verdet constant for
different transparent materials. The Verdet constant is measured by using the Faraday Effect which is a
magneto-optical phenomenon; mean it describes the rotation of the plane of polarization of light with in a
4. 4 | P a g e
medium when it is placed in an external magnetic field. So this experiment determines the rotation of the
plane of polarization with respect to the wavelength and the magnetic field.