On 6/18/2025 7:59 AM, Alan Grayson wrote:
On Tuesday, June 17, 2025 at 2:07:34 PM UTC-6 Brent Meeker wrote:
On 6/16/2025 9:56 PM, Alan Grayson wrote:
On Monday, June 16, 2025 at 10:47:25 PM UTC-6 Brent Meeker wrote:
On 6/16/2025 9:26 PM, Alan Grayson wrote:
I admit that I don't know how a clock is constructed by the
fact that there is a known, fixed frequency of emitted
radiation in the decay from the first excited state to the
ground state of Cesium 133. Further, I also don't see how a
clock can be constructed by a statistical quantity of the
half-life of a muon. The decay time for any muon is
undetermined, so how can a clock be constructed by its decay
time? TY, AG --
Because you can have bazillions of them and get a pretty
accurate interval by counting up to say a million decay events.
Brent
Who or what does the counting? Seems rather impractical. AG
It would be possible to count them electronically, but I wouldn't
claim it was practical. Maybe that's why there are no muon clocks
and atomic clocks don't use decay rates.
Brent
Apparently, for Cesium 133, there's a particular transition which has
a frequency suitable for defining a second. How is this any help in
building a clock if we don't know, and apparently can't know, when
such a transition will occur? AG
I think I already posted that the atoms are excited with a tunable
microwave tuned so that the absorbed and emitted EM frequencies are the
same, in other words in resonance with the Ce-133 transition. Then the
frequency of the microwave is used as the clock.
Brent
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