Date: Mon, 28 Oct 2002 09:27:36 -0600

Author: Cynthia Coutre

Subject: RE: annoying Xenon

Post:

What's even worse is Xenon on little sports cars like the Honda S2000. The
car is so low to the ground that the headlights shine right into on coming
drivers' eyes. Honda intentionally sets the left headlight lower than the
right to try to reduce the glare, but this also cuts the visibility distance
of the S2000 driver... and takes some getting used to to drive with
significantly misaligned headlights.

Cynthia

>===== Original Message From Chuck Britton =====
>Technically called HID = High Intensity Discharge.
>
>The TRUE HID lamps are only on VERY high end European cars.
>The system id VERY difficult to past the NHTSA or whoever approves imports.
>
>Approved HID systems must have some kind of mechanical system that
>reduces the vicious glare that results from bad aimed lights.
>
>Do a google on HID headlights.
>
>Every auto supply store is now selling PSEUDO-HID kits that use
>selective reflection and absorption to simulate the annoyance of the
>true HID.
>
>
>At 3:37 PM -0500 10/25/02, Thomas Senior wrote:
>>Zig,
>> That's all i know, that they are xenon and probably have a line
>>spectrum. Stand by an interstate at night and watch the headlights go
>>by through a driffraction grating. Hours of fun.

Cynthia Coutre
Lab Manager, Webmaster
Dept of Physics and Astronomy
Vanderbilt University
Box 1807, Station B
Nashville, TN 37235

Office: 6301E Stevenson Center
Phone: (615) 343-7710
Fax: (615) 343-7263
From dkard@ceu.edu Mon Oct 28 11:08:39 2002
Message-ID: <6205E2D92BA6D6118F0000A0C9AD187B34EEFB@ceu.edu>
From: David Kardelis
To: "'tap-l@listproc.appstate.edu'"
Subject: RE: What is a Vector Capable Calculator?
Date: Mon, 28 Oct 2002 09:00:18 -0700
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The HP 48 series calculators can do vector manipulation in a variety of
formats.
You type in the magnitude and direction (angle) and you can add forces on
the fly and get the resultant in mag+ direction and quickly convert to x-y
components. My students showed me this one. The TI graphing calculators do
it too.

dave

David Kardelis 451 E 400 N
Chairman, Dept of Chemistry and Physics Price, UT 84501
College of Eastern Utah

Dkard@ceu.edu
435-613-5258
435-613-4102 (fax)


-----Original Message-----
From: George M. Caplan [mailto:gcaplan@wellesley.edu]
Sent: Saturday, October 26, 2002 2:37 PM
To: tap-l@listproc.appstate.edu
Subject: What is a Vector Capable Calculator?

The preface to the 6th ed. of Fundamentals of Physics by Halliday,
Resnick, etc.
mentions "vector-capable calculators". What does this mean?
Can someone give me some examples of these?
From gkarshner@stmarytx.edu Mon Oct 28 11:59:05 2002
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Date: Mon, 28 Oct 2002 12:00:49 -0600
To: tap-l@listproc.appstate.edu
From: Gary Karshner
Subject: Re: Visible Scintillation
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George,
You bring back my misspent youth. There is a device call a
spinthariscope that shows just the effect you are after. It consists of a
zinc sulfide screen and typically a small radium source (alpha particle
source). The alpha particles cause the zinc sulfide screen scintillate. You
need to look at it with dark adapted eyes.
The instrument was invented my Sir William Crookes. It served as
the basic detector for most of Rutherford's experiment, and probably
motivated Geiger to invent his tube since he did much of the counting for
Rutherford's group.
You might look at some old issues of American Journal of Physics
for plans. The radium source is like the one used in a cloud chamber.

Gary


At 09:46 AM 10/26/02 -0400, you wrote:
>I just taught my first gamma spectroscopy lab.
>I am now recuperating. ;-)
>Anyway, we use an NaI detector with a photomultipler tube.
>Can I get an NaI crystal, or some other device, that I can use
>to show the students the scintillations? In the current lab set up,
>they get no chance to see the photons with their own eyes.

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