[time-nuts] Measuring speed of light or reproducing a metre

[DaveH]

Something a bit similar was first published by Nick Hood in 2007.

Here is a copy:

http://www.sciencebuddies.org/science-fair-projects/project_ideas/Phys_p056.
shtml

Here is Nick's website:

http://cullaloe.com/

Some people use marshmallows.

Dave

> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Chris Albertson
> Sent: Sunday, June 23, 2013 20:36
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Measuring speed of light or 
> reproducing a metre
> 
> I think one classic way to measure the speed of light is to build a
> resonant microwave cavity.  Measure the physical dimensions 
> VERY accurately
> and then measure the resonant frequency.
> 
> 
> On Sun, Jun 23, 2013 at 4:41 PM, Bob Camp <lists at rtty.us> wrote:
> 
> > Hi
> >
> > Pulse -> (fast) LED
> > LED -> splitter
> > splitter -> 2 (fast) photo diodes
> >
> > Start with the diodes in the same plane, calibrate out the 
> systematic
> > delays. Likely with a deliberate offset (coax cable length).
> >
> > Move one detector and note the change in time. Distance 
> would be highly
> > dependent on how fast your LED is and how fast your detectors are.
> >
> > Bob
> >
> > On Jun 23, 2013, at 7:03 PM, Jim Palfreyman 
> <jim77742 at gmail.com> wrote:
> >
> > > Hi all,
> > >
> > > With a 3325B, a 5370B, and other time-nut miscellany, 
> what's the quickest
> > > way you can come up with to measure the speed of light OR 
> reproduce the
> > > metre.
> > >
> > > I've got some ideas, but I'd like others' thoughts.
> > >
> > > Jim
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> 
> 
> 
> -- 
> 
> Chris Albertson
> Redondo Beach, California
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