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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1873
DTSTART:20110429T210000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T142949Z
LAST-MODIFIED:20110422T123740Z
LOCATION:2241 Chamberlin Hall (coffee at 3:30 pm)
SUMMARY:Atomic Clocks: Does Anybody Really Know What Time It Is?\, Phy
 sics Department Colloquium\, Thomas R. O'Brian\, National Institute of
  Standards and Technology (NIST) and JILA
DESCRIPTION:Time is the most accurately measured absolute quantity. Th
 e world's best atomic clocks at the National Institute of Standards an
 d Technology (NIST) measure time with absolute uncertainties about 8 x
  10-18\, the equivalent of one second in 4 billion years. At this prec
 ision\, relativistic time dilation is evident at jogging speeds or 10 
 cm changes in altitude. We will discuss how atomic timekeeping underpi
 ns a broad range of our technology infrastructure\, enables innovative
  measurements for everything from brain activity to mineral exploratio
 n - and how related to atomic timekeeping has stimulated some of the m
 ost important advances in atomic and optical physics.
URL:https://www.physics.wisc.edu/events/?id=1873
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