advertisement

Discovery of Cosmic Rays

67 %
33 %
advertisement
Information about Discovery of Cosmic Rays
Entertainment

Published on October 13, 2007

Author: Kestrel

Source: authorstream.com

advertisement

Discovery of Cosmic Rays:  Discovery of Cosmic Rays What are they? Where do they come from? Who cares? Discovery of Radioactivity:  Discovery of Radioactivity In 1896 Antoine Becquerel accidentally discovered radioactivity. Left Uranium on a photographic plate inside a closed box. Decide to develop photograph expecting to see nothing He saw an image of the Uranium crystal!!! How can this happen if there was no light in the box?? http://www.chem.duke.edu/~jds/cruise_chem/nuclear/discovery.html Discovery of Radioactivity:  Discovery of Radioactivity Pierre and Marie Currie became interested in Becquerel's discovery. They coined the term “radioactivity”. 1903 Becquerel and the Curie’s won Nobel prize. In 1911 Marie Curie awarded Nobel prize for discovering new radioactive elements, Polonium and Radium. http://www.ndt-ed.org/EducationResources/HighSchool/Radiography/curies.htm The attention that English scientists paid to the Curies' work helped make them household names in that country, as in this famous caricature, “Radium,” from the popular British periodical Vanity Fair. http://www.aip.org/history/curie/recdis1.htm Radioactivity:  Radioactivity The spontaneous process of nuclei undergoing a change by emitting particles or rays is called radioactive decay. http://library.thinkquest.org/17940/texts/radioactivity/radioactivity.html Radioactivity:  Radioactivity Radioactive nuclei degenerate in three ways: Alpha decay (He nucleus ejected) Bata decay (e- ejected) Gamma rays (high energy E-M radiation) Detection of Radiation:  Detection of Radiation Geiger Counter The device is named after the German physicist Hans Geiger. Detects particles emitted by radioactive sources. Makes an audible clicking noise when particles pass through chamber. http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0016005.html Discovery of Cosmic Rays:  Discovery of Cosmic Rays From 1911 to 1913 Victor Hess measured radiation levels at various altitudes (up to 17,500 ft) in the Earth’s atmosphere. Radiation levels increased with altitude! This radiation was called “Cosmic Radiation” later became “Cosmic Rays”. Won Nobel Prize in 1936. http://hires.physics.utah.edu/reading/intro.html What are Cosmic Rays?:  What are Cosmic Rays? Charged particles (protons, electrons, and other atomic nuclei) coming from outer space. Traveling at near the speed of light, 186,000 miles per second, or 300,000 km per second. Where do they come from? How did they get accelerated to such high speeds? What are Cosmic Rays?:  What are Cosmic Rays? High speed protons and electrons, primary particles, strike Earth’s upper atmosphere. Nuclear collisions produce a shower of secondary particles, called muons. It is mainly these muons that are observed on Earth’s surface. Possible Origins of Cosmic Rays:  Possible Origins of Cosmic Rays The Sun The Big Bang Supernovae Gamma Ray Bursts The Big Bang:  The Big Bang Creation of universe is thought to have occurred about 15 billion years ago. Gigantic explosion of something, possibly a black hole. http://liftoff.msfc.nasa.gov/academy/universe/b_bang.html The Big Bang:  The Big Bang Big Bang created a lot of high energy g-rays. If two g-rays collide they create high energy particles. Some these particles may have become what we now call cosmic rays Supernovae:  Supernovae A massive star explodes. Ejects protons, electrons and other atomic nuclei. These particles may become cosmic rays. The most likely origin for cosmic ray particles. Supernovae:  Supernovae Crab nebula shows the remnant of a supernova explosion that occurred in 1054 AD. Observed in the daytime by Chinese astronomers. Supernovae:  Supernovae Pulsar is a rapidly rotating neutron star If jets sweep past the Earth then we see a pulse. Particles can be ejected out the jet. These particles may be observed at the Earth as Cosmic Rays. Supernovae:  Supernovae Crab Nebula shows this type of jet structure. This is a combined image from visual and X-ray pictures. Supernovae:  Supernovae When massive (>8 Suns) stars die they explode as supernovae. They create a black hole. Supernovae:  Supernovae Cygnus X-1 is an X-ray binary star. An observable hot blue star appears to be orbiting nothing. This nothing appears to have 10 solar masses and is thought to be a black hole. Active Galaxies:  Active Galaxies Some galaxies have large radio jets. These jets are emitting at all wavelengths. They also are ejecting high energy particles. Active Galaxies:  Active Galaxies These galaxies have strong jets. Thought to have super massive black holes in there nucleus. 106 or 109 solar masses. High energy particles emitted along jets. Gamma Ray Bursts:  Gamma Ray Bursts Intense Gamma Ray bursts detected by orbiting space telescopes. Burst only last a few seconds. Occur randomly over the entire sky Gamma Ray Bursts:  Gamma Ray Bursts Thought to be caused by colliding neutron stars. Probably emit high energy particles. Solar Flares:  Solar Flares RHESSI spacecraft images of gamma-rays (blue) and X-rays (red) thrown off by the hottest part of the flare are shown with UV images from the TRACE spacecraft. The gamma rays are made by energetic protons at the Sun. Scientists were surprised that the gamma rays matched the energy spectrum of protons at Earth: the proton storm may have come directly from the Sun and not from the CME as anticipated. http://cse.ssl.berkeley.edu/hessi_epo/html/rhessi_gallery.html RHESSI and TRACE View of January 20, 2005 Solar Flare Slide24:  Detecting Cosmic Ray Showers http://ast.leeds.ac.uk/haverah/dets.shtml What questions do you have?:  What questions do you have? Take out a sheet of paper and write down any questions you have concerning radiation from cosmic rays? Yes we will collect them so everyone participates. Who Cares:  Who Cares May affect weather and climate May affect health May be used for homeland security Curiosity Therefore, YOU should care because these particles are streaming though the air and passing through your body every second and may be affecting your life! Slide27:  Detecting Cosmic Rays Across Georgia Are cosmic ray hits evenly distributed over a large area? Want to place detectors in middle and secondary schools around the state and let students count muon incident rate. Observing Cosmic Rays from your School:  Observing Cosmic Rays from your School Observing Cosmic Rays from your School:  Observing Cosmic Rays from your School Observing Cosmic Rays from your School:  Observing Cosmic Rays from your School Observing Cosmic Rays from your School:  Observing Cosmic Rays from your School Scientific Results:  Scientific Results Student observations that show changes in count rate during the intense Solar Activity that occurred in the Fall of 2003. Taking Action We now will:  Taking Action We now will show you how to set up and use detectors here at your school show you some possible experiments you can run to help GSU scientists learn about Cosmic Ray Showers. show you how to submit your results to GSU scientists. Resources:  Resources Chaisson and McMillian, (2005). Astronomy Today (5th Ed.) Shipman, Wilson, and Todd, (2003). An Introduction to Physical Science (10th Edition).

Add a comment

Related presentations

Related pages

Cosmic ray - Wikipedia

Cosmic rays are immensely high-energy radiation, mainly originating outside the Solar System. Upon impact with the Earth's atmosphere, cosmic rays can ...
Read more

Cosmic Rays - Richard Mewaldt

Discovery and Early Research: Cosmic rays were discovered in 1912 by ... Cosmic Ray Composition: Cosmic rays include essentially all of the elements in ...
Read more

The Discovery of Cosmic Rays - apps3.aps.org

1900-1908 Important background discovery Discovery of radioctivity, Nobel Prize to Becquerel, Marie and Pierre Curie In action on penetrating radiation:
Read more

Audience The Discovery and Nature of Cosmic Rays

1 CRaTER: The Discovery and Nature of Cosmic Rays. Learning Objectives: • Students will learn how cosmic rays were discovered and what they are.
Read more

Cosmic Rays Still Mysterious 100 Years After Discovery

One hundred years after the discovery of cosmic rays, scientists still aren't exactly sure where the ultra-fast particles come from.
Read more

Cosmic Rays - Sektion Physik der CAU Kiel

Discovery of Interstellar Material. Illustration 1: The Crab Nebula. In 1936 Viktor Hess received the Nobel Prize for the discovery of "Höhenstrahlung ...
Read more

What are Cosmic Rays?! - Nagoya University

What areWhat are Cosmic Rays?!Cosmic Rays?! What are Cosmic Rays?! By Hayanon Translated by Y. Noda and Y. Kamide Supervised by Y. Muraki
Read more

The Discovery of Cosmic X-rays | Multiwavelength Astronomy

The Discovery of Cosmic X-rays Early Interest in Science; Graduate School and the Rossi Cosmic Ray Group; Measuring Very-High-Energy Cosmic Rays;
Read more

Homage to the Discovery of Cosmic Rays, the Meson-Muon ...

Jorge A. - Homage to the Discovery of Cosmic Rays, the Meson-Muon & Solar Cosmic Rays (Space Science jetzt kaufen. ISBN: 9781634830843, Fremdsprachige ...
Read more

Cosmic rays: particles from outer space | CERN

Cosmic rays: particles from outer space. Earth is subject to a constant bombardment of subatomic particles that can reach energies far higher than the ...
Read more