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This is a tried and true 7 keys to winning football games. A head football coach that designs his practice and workouts around these key factors will have a competitive football program.
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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.
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Paraphrasing Louis XV(1710 – 1774) of France, were he not such a humble, unassuming man,Röntgenmight have said "A.
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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.
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Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdf
Atomic Structure and Radioactivity
1.
2. Greek philosopher Democritus
proposed that all matter, “ the stuff”
that makes us the world around us, is
actually composed of tiny, invisible
particles.
10. The atom is mostly
empty space. Its mass
is concentrated in the
nucleus. (Nuclear
Model)
The protons and
neutrons are particles
inside the nucleus.
He proposed the atomic
model which is called
nuclear atom.
The nucleus is tiny and
densely packed
compared with the
atom as a whole.
11. a Danish physicist
who developed the
Bohr model of the
atom and the
principles of corre
spondence and
complementarity.
He and Werner He
isenberg developed
the “Copenhagen
interpretation” of
quantum theory.
12. Bohr model shows the atom as a
small, positively charged nucleus
surrounded by orbiting electrons.
He discovered that electrons travel
in separate orbits around the nucleus
and that the number of electrons in
the outer orbit determines the
properties of an element.
13. The chemical element bohrium (Bh),
No. 107 on the Periodic Table of the
Elements, is named for him.
The atom is like a solar system. Its
mass is concentrated in the nucleus
in circular orbits.
Each electron carries discrete
amount of energy and does lose any
energy as long as it stays in its given
orbit.
14. Electron that has
received enough
energy can jump to a
higher energy orbit.
Upon return to a
lower energy orbit,
energy is emitted in
the form of light.
The energy of the
light emitted is
equal to the energy
of the two orbits
involved in the
transition.
15. Wilhelm Roentgen
materials used as anodes in vacuum
tubes gave off highly penetrating
radiations, which is like light in some
properties are what we know as x-rays.
X-rays pass through paper, wood, light
metals like aluminum and even human
flesh.
X-rays can be completely stopped by a
thin layer of metals such as platinum,
gold, or lead and by any human bones.
16. At the end of 1895, Wilhelm Röntgen
discovered X rays. Becquerel learned
that the X rays issued from the area
of a glass vacuum tube made
fluorescent when struck by a beam of
cathode rays.
He undertook to investigate whether
there was some fundamental connection
between this invisible radiation and
visible light such that all luminescent
materials, however stimulated, would
also yield X rays.
17. To test this hypothesis, he placed
phosphorescent crystals upon a photographic
plate that had been wrapped in opaque paper
so that only a penetrating radiation could
reach the emulsion.
He exposed his experimental arrangement to
sunlight for several hours, thereby exciting
the crystals in the customary manner. Upon
development, the photographic plate revealed
silhouettes of the mineral samples, and, in
subsequent experiments, the image of a coin
or metal cutout interposed between the
crystal and paper wrapping.
18.
19. Marie and Pierre Curie
Marie described the
behaviour of uranium
and thorium as
radioactivity.
Also, she was the first
to study radioactivity/
20. Marie Curie discovered two new
elements: radium and polonium. We
now know these are inevitable by
products of uranium.
Science tells us, for example, that all
material things are made up of tiny
atoms. The atoms found in most
substances are remarkably stable,
but in the case of radioactive
materials, the atoms are unstable.
Editor's Notes
Radioactivity is the process in which unstable atomic nuclei spontaneously decompose to form nuclei with a higher stability by the release of energetic sub atomic particles.
Becquerel reported this discovery to the Académie des Sciences at its session on February 24, 1896, noting that certain salts of uranium were particularly active.