Ce diaporama a bien été signalé.
Nous utilisons votre profil LinkedIn et vos données d’activité pour vous proposer des publicités personnalisées et pertinentes. Vous pouvez changer vos préférences de publicités à tout moment.
A Sense of Time<br />Three Rivers Science SymposiumUniversity of Saint FrancisSister Carol Meyers <br />
How old?<br />Time has been measured in manyways: Lunarcalendars, Julian calendars, Gregoriancalendars, etc. <br />Tree ri...
Geological Time Scale    (in millions of years) <br />The Holocene (the latest epoch) is too short to be shown clearly on ...
To obtain the content ratio of isotopes 40Ar to 39K in a rock or mineral, the amount of Ar is measured by mass spectrometr...
RadiocarbonDating<br /><ul><li>14C is produced in a steady amount in the atmosphere when 14N is struck by a neutron. The N...
As long as a substance is living its interchange of CO2 keeps the amount of 14C constant.
At death the 14C decays by emitting a beta particle to become 14N.
14C decays with a half-life of 5,730 years</li></ul>Click on picture for video<br />
The Structure claimed to be the Noah's Ark in Durupınar site, Agri, Turkey<br />Noah’s Ark would be around 2900 BC  making...
Tutankhamun ruled Egypt between 1334 and 1325 BC. He was probably the 12th ruler of Egypt's 18th Dynasty.<br /> <br />
Prochain SlideShare
Chargement dans…5
×
Prochain SlideShare
Html5 case-studies-full
Suivant

1

Partager

Science Symposioum 2011 - University of Saint Francis

A slideshow from the Science Symposium hosted by University of Saint Francis. This is about mummies and there are relevant pictures attached to this slide show.

Science Symposioum 2011 - University of Saint Francis

  1. 1. A Sense of Time<br />Three Rivers Science SymposiumUniversity of Saint FrancisSister Carol Meyers <br />
  2. 2. How old?<br />Time has been measured in manyways: Lunarcalendars, Julian calendars, Gregoriancalendars, etc. <br />Tree rings canbeused to tell the age of a tree<br />Radioactivitycanbeused to tell the age of rocks, icecores, etc. <br />Click on picture to hear how we tell the age of things<br />
  3. 3. Geological Time Scale (in millions of years) <br />The Holocene (the latest epoch) is too short to be shown clearly on this timeline<br />
  4. 4. To obtain the content ratio of isotopes 40Ar to 39K in a rock or mineral, the amount of Ar is measured by mass spectrometry of the gases released when a rock sample is melted in flame photometry or atomic absorption spectroscopy.<br />The isotopic composition of oxygen atoms in the Earth's atmosphere is 99.759% 16O, 0.037% 17O and 0.204% 18O.[10] Because water molecules containing the lighter isotope are slightly more likely to evaporate and fall as precipitation,[11] fresh water and polar ice on earth contains slightly less (0.1981%) of the heavy isotope 18O than air (0.204%) or seawater containing (0.1995%). This disparity allows analysis of temperature patterns via historic ice cores<br />Isotope ratios <br />
  5. 5. RadiocarbonDating<br /><ul><li>14C is produced in a steady amount in the atmosphere when 14N is struck by a neutron. The Nucleus emits a positron which turns a proton into a neutron
  6. 6. As long as a substance is living its interchange of CO2 keeps the amount of 14C constant.
  7. 7. At death the 14C decays by emitting a beta particle to become 14N.
  8. 8. 14C decays with a half-life of 5,730 years</li></ul>Click on picture for video<br />
  9. 9. The Structure claimed to be the Noah's Ark in Durupınar site, Agri, Turkey<br />Noah’s Ark would be around 2900 BC making it 4910 years old today <br />
  10. 10. Tutankhamun ruled Egypt between 1334 and 1325 BC. He was probably the 12th ruler of Egypt's 18th Dynasty.<br /> <br />
  11. 11. The fossil was dated reliably in 1990–1992 by applying the argon-argon radiometric dating method to the volcanic ash surrounding Lucy. Initial attempts were made in 1973 and 1974 to estimate the age of the fossil using the potassium-argon radiometric dating method. Found to be 3.22 and 3.18 million years . <br />Lucy’s skeleton reconstructed<br />Cleveland Museum of Natural History <br />Louis and Mary Leakey made Olduvai Gorge, located within what is now the famous Serengeti Park in Tanzania, their domain.<br />
  12. 12. 5,300-year-old mummy known as Otzi was found in 1991Bone studies (from nine different samples) suggest that, when he died, the Iceman was 45.7 years of age<br />
  13. 13. Click on picture to see Sherlock Holmes<br />
  • MahineshMani

    Nov. 24, 2017

A slideshow from the Science Symposium hosted by University of Saint Francis. This is about mummies and there are relevant pictures attached to this slide show.

Vues

Nombre de vues

646

Sur Slideshare

0

À partir des intégrations

0

Nombre d'intégrations

46

Actions

Téléchargements

0

Partages

0

Commentaires

0

Mentions J'aime

1

×