I went out today for a longish solo bimble around my
favourite lanes (oh all right then, pubs). I noticed that
during the day I passed from Warwickshire into
Worcestershire and vica versa several times. Now, it
occurred to me, at one off these crossings that as
Borsetshire is mythically located between Warks and Worcs, I
had also crossed that county several times - and at a speed
somewhat in excess of the speed of light.
Listen out for the sonic booms over Ambridge in tomorrow's
Archers. That'll be me. :-)
Er, actually, it wouldn't be a sonic boom would it? What's
the light equivalent? Photic boom?
--
Cheerful Pedalling John Mallard
Tony Raven
John Mallard wrote:
>
> Er, actually, it wouldn't be a sonic boom would it? What's
> the light equivalent? Photic boom?
Cherenkov Radiation
Tony
John Mallard
Tony Raven wrote:
> John Mallard wrote:
>>
>> Er, actually, it wouldn't be a sonic boom would it?
>> What's the light equivalent? Photic boom?
>
> Cherenkov Radiation
Blimey! What's that!?
It's OK, I'm off to drop Cherenkov Radiation into Google (I
may be some time)
--
Cheerful Pedalling John Mallard
John Mallard
dirtylitterboxofferingstospammers wrote:
>> It's OK, I'm off to drop Cherenkov Radiation into Google
>
> You could set off a chain reaction if you do, one which
> could destroy the planet. Be careful!
Ooh noo! ;-)
--
Cheerful Pedalling John Mallard
Marc
In article <20040523162813.09674.00001913@mb-m02.aol.com>,
wafflycathcs@aol.comcomcom says...
> >It's OK, I'm off to drop Cherenkov Radiation into Google
>
> You could set off a chain reaction if you do, one which
> could destroy the planet. Be careful!
>
I think your theory is the work of a crank!
Tony Raven
dirtylitterboxofferingstospammers wrote:
>> I think your theory is the work of a crank!
>
> harumph! I only pedal legitimate science! You deserve a
> spoke in the eye for that!
>
Get out your chain whip and give him some wheels ;-)
Tony
John Hearns
On Sun, 23 May 2004 21:11:12 +0100, John Mallard wrote:
>
>
> Er, actually, it wouldn't be a sonic boom would it? What's
> the light equivalent? Photic boom?
There is an equivalent to a sonic boom. When a particle goes
faster than the speed of light in a certain medium,
Cherenkov radiation is emitted.
No, that's not a nonsense statement. The speed of light in a
vacuum is an absolute limit. In matter, such as water or
glass or air, light travels more slowly. This slowing down
factor is the index of refraction. Now, if a particle is
emitted by (say) a radioactive source or a collision at a
particle accelerator and enters the medium going faster than
the speed of light in that medium, light is given off as a
sort of shock wave. That is the source of the blue glow
which film makers love when showing shots of nuclear reactor
cooling ponds.
Cherenkov radiation is also used as an important detection
technique in particle physics. The angle of the cherenkov
cone gives information on the velocity.
"Tony Raven" <junk@raven-family.com> wrote in message
news:2hcf7vFb9pegU1@uni-berlin.de...
> John Mallard wrote:
> >
> > Er, actually, it wouldn't be a sonic boom would it?
> > What's the light equivalent? Photic boom?
>
> Cherenkov Radiation
That's given off when light "slows down" isn't it, from a
"faster" medium to a "slower" one?
--
Simon M.
Robert Bruce
mae <john@nospam.nospam> wedi ysgrifennu:
> On Mon, 24 May 2004 12:54:23 +0100, Simon Mason wrote:
>
>>
>>> John Mallard wrote:
>>>>
>>>> Er, actually, it wouldn't be a sonic boom would it?
>>>> What's the light equivalent? Photic boom?
>>>
>>> Cherenkov Radiation
>>
>> That's given off when light "slows down" isn't it, from
>> a "faster" medium to a "slower" one?
> Not meaning to be rude, but not quite. when light enters a
> medium which is "slower" - ie. there is a higher index of
> refraction, it bends. That's how lenses work. The bend is
> given by Snells' Law.
Lynda or Robert???
--
Rob
Please keep conversations in the newsgroup so that all may
contribute and benefit.
Simon Mason
"John Hearns" <john@nospam.nospam> wrote in message
news:pan.2004.05.24.12.17.26.498261@nospam.nospam...
> On Mon, 24 May 2004 12:54:23 +0100, Simon Mason wrote:
>
> >
> >> John Mallard wrote:
> >> >
> >> > Er, actually, it wouldn't be a sonic boom would it?
> >> > What's the light equivalent? Photic boom?
> >>
> >> Cherenkov Radiation
> >
> > That's given off when light "slows down" isn't it, from
> > a "faster"
medium
> > to a "slower" one?
> Not meaning to be rude, but not quite. when light enters a
> medium which is "slower" - ie. there is a higher index of
> refraction, it bends. That's how lenses work. The bend is
> given by Snells' Law. Also, the bend is the exact right
> size to minimise the total time taken to go from start to
> end through both medium. This is known as the "Principle
> of Least Time". I Trust you are all enjoying this
> morning's physics tutorial?
Indeed I am. So when I am measuring the Refractive Index of
a chemical in our lab at BP, like I have done for the past
30 years, I can now finally understand what I've been doing
all this time. Thanks ;-)
Now if you can explain in layman's terms how our
Inductively Coupled Plasma Emission Spectrophotometer
works, when I measure the Iridium content of a substance
I'll be a happy man ;-)
--
Simon M.
Colin Blackburn
On Mon, 24 May 2004 13:24:42 +0100, Simon Mason
<simon@simonmason.karoo.co.uk> wrote:
> Now if you can explain in layman's terms how our
> Inductively Coupled Plasma Emission Spectrophotometer
> works, when I measure the Iridium content of a substance
> I'll be a happy man ;-)
That one's easy. It works by magic.
Colin
Simonb
Simon Mason wrote:
> Now if you can explain in layman's terms how our
> Inductively Coupled Plasma Emission Spectrophotometer
> works, when I measure the Iridium content of a substance
> I'll be a happy man ;-)
Who do you think he is? A particle physicist?!
Kuh.
Simon Mason
"John Hearns" <john@nospam.nospam> wrote in message
news:pan.2004.05.24.13.00.05.397083@nospam.nospam...
> On Mon, 24 May 2004 13:24:42 +0100, Simon Mason wrote:
>
> >
> > Now if you can explain in layman's terms how our
> > Inductively Coupled
Plasma
> > Emission Spectrophotometer works, when I measure the
> > Iridium content of
a
> > substance I'll be a happy man ;-)
>
> You've got me there! Dang nebbit, honest to betsy, pesky
> spectrophotometers...
LOL. BTW, I would have *loved* to have been a particle
physicist. It must be fantastic to peer into the inner
workings of the Universe by unravelling weirder and more
and more numerous sub atomic particles, then having to come
up with some theory (and the "proof") of how they all fit
together. So you are doing my dream job, but I wasn't any
good at maths, so I would have been no use at it :-)
OT : And you get to play with a SynchroCYCLOtron!
--
Simon M.
Roos Eisma
John Hearns <john@nospam.nospam> writes:
>On Mon, 24 May 2004 14:04:18 +0100, Simon Mason wrote:
>> LOL. BTW, I would have *loved* to have been a particle
>> physicist. It must be fantastic to peer into the inner
>> workings of the Universe by unravelling weirder and more
>> and more numerous sub atomic particles, then having to
>> come up with some theory (and the "proof") of how they
>> all fit together.
>Well, many nights spent staring at computer screens down
>deep holes in the French countryside. So you
>> are doing my dream job, but I wasn't any good at maths,
>> so I would have been no use at it :-)
>Truth be told, I make my living these days configuring and
>installing Linux clusters (Beowulfs).
Most dream jobs probably turn out to be not as fantastic
when actually living that dream...
I started off in theoretical physics, planning to understand
All about the 11 Hidden Dimensions. Passing through
computational physics, atmnospheric sciences and
internet/new media programming I'm now researching ICT for
older people...
Roos
Gawnsoft
On Mon, 24 May 2004 10:34:18 +0100, John Hearns
<john@nospam.nospam> wrote (more or less): ...
>Going wildly off-topic, Cherenkov radiation is used as
>the basis for several many very interesting detectors.
>I'm a particle physicist. Bet you regret asking the
>question now :-)
>
>In deep, clear water neutrino observatories suspend strings
>of photomultipliers in spherical pressure housings.
>http://www.nikhef.nl/pub/experiments/antares/introe.htm
>Sounds fun. Plenty of sunshine out in the Med off Corsica.
>
>The Sudbury detector is deep in a mine in Canada
>http://www.sno.phy.queensu.ca/ It uses a huge tank of super
>pure water.
>
>The Kamiokande project used a deep mine in Japan (till
>someone left the tap on and overfilled the water. Oops).
>http://www-sk.icrr.u-tokyo.ac.jp/doc/sk/index.html
>
>And some lucky graduate students get to go to the South
>Pole to operate detectors buried in the ice:
>http://www.amanda.uci.edu/public_info.html
And still others only get to go to Yorkshire, into the
deepest darkest parts of a coal mine htere. (Mind you, I
only know that detector is for neutrinos. Maybe it isn't a
Cherenkov radiation detector, but some other kind of
neutrino meter.)
"Roos Eisma" <roos@xs4all.nl> wrote in message
news:40b1fe32$0$568$e4fe514c@news.xs4all.nl...
>
> Most dream jobs probably turn out to be not as fantastic
> when actually living that dream...
>
> I started off in theoretical physics, planning to
> understand All about the 11 Hidden Dimensions. Passing
> through computational physics, atmnospheric sciences and
> internet/new media programming I'm now researching ICT for
> older people...
Well I hope there are still a few of you trying to sort it
all out ;-) You're right about the job though, I find more
pleasure in cycling to and from work than the actual job
and it's a very good job, all things considered.
--
Simon M.
Simon Mason
"Trevor Barton" <tmb@Xisotek.co.uk> wrote in message
news:slrncb40eb.5t4.tmb@sheep.isotek.co.uk...
>
> The way it works is that you put the sample in, probably
> after preparing it in some manner, and then pres a few
> buttons in some predetermined order, and then wait a while
> while the machine whirs and pops, and then something
> either appears on the screen or from a printer giving you
> the answer.
That's more or less the gist of it!
Simon Mason
"Trevor Barton" <tmb@Xisotek.co.uk> wrote in message
news:slrncb40eb.5t4.tmb@sheep.isotek.co.uk...
>
> The way it works is that you put the sample in, probably
> after preparing it in some manner, and then pres a few
> buttons in some predetermined order, and then wait a while
> while the machine whirs and pops, and then something
> either appears on the screen or from a printer giving you
> the answer.
That's more or less the gist of it!
Simon Mason
"John Hearns" <john@nospam.nospam> wrote in message
news:pan.2004.05.24.14.26.06.951894@nospam.nospam...
> On Mon, 24 May 2004 13:52:50 +0000, Roos Eisma wrote:
>
> >
> > I started off in theoretical physics, planning to
> > understand All about
the
> > 11 Hidden Dimensions.
> OK. I'll bite. I was an experimentalist - thus barely fit
> to hit big things with a spanner. What are the 11 hidden
> dimensions?
This is what *you're* supposed to be finding out, instead
of fiddling around with poxy Linux PCs :-)
--
Simon M.
Simon Mason
"John Hearns" <john@nospam.nospam> wrote in message
news:pan.2004.05.24.14.26.06.951894@nospam.nospam...
> On Mon, 24 May 2004 13:52:50 +0000, Roos Eisma wrote:
>
> >
> > I started off in theoretical physics, planning to
> > understand All about
the
> > 11 Hidden Dimensions.
> OK. I'll bite. I was an experimentalist - thus barely fit
> to hit big things with a spanner. What are the 11 hidden
> dimensions?
This is what *you're* supposed to be finding out, instead
of fiddling around with poxy Linux PCs :-)
