From DVD Lecture UNDERSTANDING THE UNIVERSE: AN INTRODUCTION TO ASTRONOMY (UNIVERSITY OF CALIFORNIA AT BERKELY) and teacher instruction (3 1/2 hours)
Show an image and define radiation in terms of electric charge:
In physics, radiation describes any process in which energy emitted by one body travels through a medium or through space, ultimately to be absorbed by another body. ...en.wikipedia.org/wiki/Radiation
Show an image and define radiation in terms of electric charge:
In physics, radiation describes any process in which energy emitted by one body travels through a medium or through space, ultimately to be absorbed by another body. ...en.wikipedia.org/wiki/Radiation
All matter is composed of atoms and many atoms are unstable. In fact, over half of the elements in the periodic table including uranium, are in a constant process of rearranging themselves. This is not something that humanity can control.
When the nucleus of an atom attempts to become more stable, it releases energy, known as radiation. Once this happens the original atom changes into a new atom. In some instances, a new element is formed and in other cases, a new form of the original element, called an isotope, appears. The spontaneous change in the nucleus of an unstable atom that results in the emission of radiation is called radioactivity and this process of change is often referred to as the decay of atoms. (google.com)
When the nucleus of an atom attempts to become more stable, it releases energy, known as radiation. Once this happens the original atom changes into a new atom. In some instances, a new element is formed and in other cases, a new form of the original element, called an isotope, appears. The spontaneous change in the nucleus of an unstable atom that results in the emission of radiation is called radioactivity and this process of change is often referred to as the decay of atoms. (google.com)
Show an image and define Magnetic energyThe potential energy of a magnetic field
(en.wiktionary.org/wiki/magnetic_energy)
Define an Isotope (image if available):one of two or more atoms with the same atomic number but with different numbers of neutrons
(wordnetweb.princeton.edu/perl/webwn)
Define an Ion:a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons
(wordnetweb.princeton.edu/perl/webwn)
Define Ionization:Ionization is the physical process of converting an atom or molecule into an ion by adding or removing charged particles such as electrons or other ions. This is often confused with dissociation (chemistry).
(en.wikipedia.org/wiki/Ionization)
Define Plank's equation E= hv
This equation shows the property of light. The equation above is a fundamental equation to spectroscopists. Energy is equal to Planck's constant times nu (the Greek letter). Where E=energy in J or calories, h=Planks constant [6.022 x 10^-34 J·s, and v is the frequency of the photon (light) in Hz (or reciprocal seconds). Note also that another fundament equation is c=v·lambda (c=speed of light, lambda is wavelength of light).You could use the above equation, for example, to find out how much energy (in kilojoules) is carried by one einstein (one mole of photons) of red light with wavelength of 650nm. Some conversions need to take place, it you do the right maths you get 184 kJ/mol. Similarly blue light of wavelength 400 nm is 299 kJ/mol.
(yahooanswers.com)
Define Ultra violet light and upload an image:Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than x-rays, in the range 10.
(en.wikipedia.org/wiki/Ultra-violet_light)
Define Infra red light and up load an image:A color of light redder than the human eye can see. Infrared light has wavelengths that are at least twice as long as green light. Besides visible light and infrared light there are many more types of light. These differ from each other by their wavelength. ... (isc.astro.cornell.edu/~spoon/crashcourse/glossary.html)
Define an upload an image of Continuous Spectrum:Continuum of emited wave lengths.
" Bright line spectrum" and Continuous spectrum with dark lines
How can Astronomers know with absolute certainty that a particular star has Helium or any other element in it?
Because they use spectrum's. Each element has their own pattern within a spectrum. Therefore scientists recognize each elements pattern when they view light spectrum coming from a star. They analyze either the emission, absorption or continuous spectrum patterns.This is an image that shows how each element has a different line pattern.
(en.wiktionary.org/wiki/magnetic_energy)
Define an Isotope (image if available):one of two or more atoms with the same atomic number but with different numbers of neutrons(wordnetweb.princeton.edu/perl/webwn)
Define an Ion:a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons
(wordnetweb.princeton.edu/perl/webwn)
Define Ionization:Ionization is the physical process of converting an atom or molecule into an ion by adding or removing charged particles such as electrons or other ions. This is often confused with dissociation (chemistry).
(en.wikipedia.org/wiki/Ionization)
Define Plank's equation E= hv
This equation shows the property of light. The equation above is a fundamental equation to spectroscopists. Energy is equal to Planck's constant times nu (the Greek letter). Where E=energy in J or calories, h=Planks constant [6.022 x 10^-34 J·s, and v is the frequency of the photon (light) in Hz (or reciprocal seconds). Note also that another fundament equation is c=v·lambda (c=speed of light, lambda is wavelength of light).You could use the above equation, for example, to find out how much energy (in kilojoules) is carried by one einstein (one mole of photons) of red light with wavelength of 650nm. Some conversions need to take place, it you do the right maths you get 184 kJ/mol. Similarly blue light of wavelength 400 nm is 299 kJ/mol.
(yahooanswers.com)
Define Ultra violet light and upload an image:Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than x-rays, in the range 10.
(en.wikipedia.org/wiki/Ultra-violet_light)
Define Infra red light and up load an image:A color of light redder than the human eye can see. Infrared light has wavelengths that are at least twice as long as green light. Besides visible light and infrared light there are many more types of light. These differ from each other by their wavelength. ... (isc.astro.cornell.edu/~spoon/crashcourse/glossary.html)
Define an upload an image of Continuous Spectrum:Continuum of emited wave lengths.
" Bright line spectrum" and Continuous spectrum with dark lines
How can Astronomers know with absolute certainty that a particular star has Helium or any other element in it?
Because they use spectrum's. Each element has their own pattern within a spectrum. Therefore scientists recognize each elements pattern when they view light spectrum coming from a star. They analyze either the emission, absorption or continuous spectrum patterns.This is an image that shows how each element has a different line pattern.
Are all elements that are on the periodic table also found in the Universe, how do we know this?
yes,because they have not found any new elements in the universe at this time.They know this by using spectrum's.
yes,because they have not found any new elements in the universe at this time.They know this by using spectrum's.
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