Derek Pugh - Author, Educator, Story Teller,
  • Home
  • Books and Articles
    • Darwin: Origin
    • Tammy Damulkurra
    • Schoolies
    • Turn Left at the Devil Tree >
      • Press Release
      • From The Lombok Guide issue 158
      • Launch speech by Mark Heyward 11/1/14
    • Tambora: Travels to Sumbawa and the Mountain of Change >
      • Tambora Press Release
    • FORT DUNDAS >
      • FORT DUNDAS 1824-29 The British in North Australia: >
        • Fort Dundas: First Settlement in Northern Australia 1824-29
        • FORT DUNDAS gallery
    • FORT WELLINGTON 1827-29
    • PORT ESSINGTON, VICTORIA SETTLEMENT 1838-49
    • ESCAPE CLIFFS
    • DARWIN 1869
    • Poetry
    • Articles
    • The Owner's Guide to the Teenage Brain >
      • Press Release
      • Tambora, Sumbawa Gallery
  • HISTORY LECTURES
  • Stories

Stories about time - atomic clock

19/10/2013

0 Comments

 
 Use this true story when teaching about time and distance:

Atomic Clock  Isidor Rabi (1898-1988), 
The atomic clock invented in 1949 measures natural resonance frequency of atoms. 
The National Institute of Standards and Technology started using an atomic clock called NIST F-1 in Boulder Colorado 1999 to define time:  A second is defined as 9,192,631,770 vibrations of a cesium atom. The clock will lose 1 second every 20 million years. 
0 Comments



Leave a Reply.

    Picture

    Archives

    September 2020
    May 2016
    June 2014
    May 2014
    April 2014
    March 2014
    January 2014
    December 2013
    November 2013
    October 2013

    Categories

    All

    RSS Feed

Proudly powered by Weebly