definition, speed, production, properties of electromagnetic waves and electromagnetic spectrum. waves in EM spectrum and their application in daily life.
definition, speed, production, properties of electromagnetic waves and electromagnetic spectrum. waves in EM spectrum and their application in daily life.
Examples of electromagnetic waves include radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma rays. ... Microwaves are used to cook your food. Infrared waves are used in remote controls and are emitted from all warm objects, allowing them to be used to create heat-sensitive cameras
A PowerPoint Presentation for Grade 9 teachers. This presentation is ONLY suggested guide for teachers to assist them on the discussion after the activities as suggested in the Learner's Module were performed. Please feel free to add comments and suggestions. Thanks!
Examples of electromagnetic waves include radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma rays. ... Microwaves are used to cook your food. Infrared waves are used in remote controls and are emitted from all warm objects, allowing them to be used to create heat-sensitive cameras
A PowerPoint Presentation for Grade 9 teachers. This presentation is ONLY suggested guide for teachers to assist them on the discussion after the activities as suggested in the Learner's Module were performed. Please feel free to add comments and suggestions. Thanks!
History behind the invention of radio. Basic principles of radios, use of radio in aviation field. Role of radio in rescuing the Titanic ship. Development of commercial as well as aviation radios. Circuit diagram of radio. Frequency ranges used in radios. Basics of wave theory.
LECTURE 14 ATOMIC STRUCTURE ELECTRONS, PROTONS and NEUTRONS.docxmanningchassidy
LECTURE 14 ATOMIC STRUCTURE: ELECTRONS, PROTONS and NEUTRONS
The above figure displays a cathode-ray tube (CRT). Today, a CRT is described as a vacuum tube that contains one or more electron guns and a phosphorescent screen, and is used to display images. It modulates, accelerates, and deflects electron beams onto a screen tocreate the images. The images may represent electrical waveforms (in an oscilloscope), pictures (a television screen, computer monitor), radar targets, or other phenomena.
We now know that cathode rays are streams of electrons observed in discharge tubes. If an evacuated glass tube (upper image) is equipped with two electrodes and a voltage is applied, glass behind the positive electrode is observed to glow (lower image), due to electrons emitted from the negative cathode.
The above “official” account presupposes that one knows what an electron is and what are its physical properties (mass and charge). The discovery of the electron opened up a whole new chapter in the understanding of matter. This led to the realization that light and matter could not be fully understood using the classicallaws of physics, and that a totally different way of understanding nature was needed. Thus emerged, beginning in the last years of the 19th century, a completely new description of light and matter. This new description became known as quantum mechanics, and resulted in the quantum theory of atoms, molecules and the chemical bond. This is the historical journey on which we shall embark in this Lecture.
Cathode rays were discovered by Julius Plücker (1801-1868) and Johann Wilhelm Hittorf(1824-1914). Their experimental apparatus depended on two earlier inventions: 1) Volta’s battery; and, 2) a sealed glass tube in which a partial vacuum was maintained. The latter was invented by a German physicist and glassblower, Heinrich Geissler, in 1857.
Hittorf observed that some unknown rays were emitted from the cathode (negative electrode) which could cast shadows on the glowing wall of the tube, indicating the rays were traveling in straight lines. In 1890, Arthur Schuster demonstrated cathode rays could be deflected by electric fields, and William Crookes showed they could be deflected by magnetic fields.
It was these experiments on cathode rays inside the cathode ray tube that drew the attention of Röntgen. After repeating the above experiments, he began to study the radiation emitted outside the cathode ray tube, using fluorescent chemical sensors, e.g., barium platinocyanide, to detect radiation. His discovery of x-rays on November 8, 1895 was communicated to the Physico-Medical Society of Würzburg later in November, 1895. A translation of his paper appeared two months later on January 23, 1896 in the English journal, Nature. (You can dial up this article on Gallica and read it for yourself).
Paraphrasing Louis XV(1710 – 1774) of France, were he not such a humble, unassuming man,Röntgenmight have said "A.
Was gibt es Schöneres als frei zu haben, ohne Urlaub nehmen zu müssen? Hier finden Sie eine Übersicht Feiertage in Deutschland für die Jahre 2013, 2014, 2015 und 2016. Insgesamt neun gesetzliche Feiertage stehen allen Bundesbürgern zu. Die Bewohner mancher Bundesländer wie Bayern, Baden-Württemberg und NRW haben besonders viel Glück: Hier gibt es weitere regionale Feiertage.
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.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
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.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
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.
2. Perhaps the greatest theoretical achievement of
physics in the 19th century was the discovery of
electromagnetic waves. The first hint was an
unexpected connection between electric phenomena
and the velocity of light.
3. About 150 years ago, James Clerk Maxwell, an English
scientist, developed a scientific theory to explain
electromagnetic waves. He noticed that electrical fields
and magnetic fields can couple together to form
electromagnetic waves. Neither an electrical field (like
the static which forms when you rub your feet on a
carpet), nor a magnetic field (like the one that holds a
magnet onto your refrigerator) will go anywhere by
themselves. But, Maxwell discovered that a
CHANGING magnetic field will induce a CHANGING
electric field and vice-versa.
An electromagnetic wave exists when the changing magnetic field causes a
changing electric field, which then causes another changing magnetic field,
and so on forever. Unlike a STATIC field, a wave cannot exist unless it is
moving. Once created, an electromagnetic wave will continue on forever
unless it is absorbed by matter.
6. Guglielmo Maconi
After Maxwell and Hertz, the next physicist who
continued with the discovery of more developed
magnetic waves, was Guglielmo Marconi.
The Italian physicist began his experiments when he was
barely 20, building on Heinrich Hertz's discovery of radio
waves in 1888. In 1895 Marconi transmitted
recognizable electronic signals from his family home in
Pontecchio to a vertical raised antenna more than a mile
away. As radio transmission of telegraph messages and,
later, spoken words became more common and popular.
Marconi also had the first transatlantic Morse code
transmission from England to Newfoundland through
electromagnetic waves.
7.
8. Reginald Fessenden
Fessenden's most notable
achievements include the first audio
radio transmission in 1900, the first
two way transatlantic transmission in
1906 and the first broadcast of
entertainment, also in 1906. Many of
these were well ahead of their time,
and showed his insight, not only into
the technical aspects of radio, but also
the commercial elements as well.