Date: Fri, 11 Feb 2011 13:08:32

Author: William Maddox

Subject: Re: Question Speed of Light Experiment

Post:

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From: WC Maddox

We use the pulsed light source shown here to get speed in air:
http://www.klingereducational.com/products/P5_6_2_1_Measuring_With_Short_Light_Pulses-292-3.html
We use this to get speed in fiber optic
cable:http://www.arborsci.com/prod-Speed_of_Light_Apparatus-321.aspx



On 2/11/2011 12:04 PM, Zani, Gerald wrote:
> Doug,
>
> I don't recommend the rotating mirror method. It works. But I think
> that the rotating mirror device costs more money than is needed to
> really do this demo well.
>
> If you have a 1MHz oscilloscope then I don't recommend the rotating
> mirror method that Pasco sells.
>
> It is better to use the pulsed laser diode method with a 1MHz
> oscilloscope:
>
> http://physics.brown.edu/physics/demopages/Demo/optics/demo/6A0110.htm
>
> I or Cliff can provide details. Admittedly this way is homemade so
> that is a drawback.
>
> It looks like Dick berg did it with the pulsed diode too:
> http://www.physics.umd.edu/lecdem/services/demos/demosk8/k8-04.htm
>
> And he cites these references:
>
> Volker Thomsen, Precision and the Terminology of Measurement, TPT 35,
> 15-17 (1997).
> George W. Clark, An electrical measurement of the speed of light, AJP
> 69, 110-112 (2001).
> Burt Brody, The Speed Of Light: Making an Easy Time of It, TPT 41,
> 276-277 (2003).
>
> Best,
> - JZ
>
> On Fri, Feb 11, 2011 at 12:44 PM, Doug Johnson
> > wrote:
>
>
> Does anyone have a Speed of Light Experiment that they would
> recommend?? We
> are seriously looking at the Pasco setup below. Your comments
> would be
> appreciated. ...Doug J
>
> Basic Speed of Light Apparatus OS-9262
>
> http://store.pasco.com/pascostore/showdetl.cfm?&DID=9&Product_ID=50688&group
> ID=635&Detail=1
>
>
>
>
>
>
> --
> Gerald Zani
> Demonstration Manager
> Physics
> Brown University
> (401) 863-3964
>


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From: WC Maddox

We use the pulsed light source shown here to get speed in air:
http://www.klingereducational.com/products/P5_6_2_1_Measuring_With_Short_Light_Pulses-292-3.html
We use this to get speed in fiber optic
cable:http://www.arborsci.com/prod-Speed_of_Light_Apparatus-321.aspx



On 2/11/2011 12:04 PM, Zani, Gerald wrote:
Doug,

I don't recommend the rotating mirror method. It works. But I
think that the rotating mirror device costs more money than is
needed to really do this demo well.

If you have a 1MHz oscilloscope then I don't recommend the
rotating mirror method that Pasco sells.

It is better to use the pulsed laser diode method with a 1MHz
oscilloscope:

http://physics.brown.edu/physics/demopages/Demo/optics/demo/6A0110.htm


I or Cliff can provide details. Admittedly this way is homemade
so that is a drawback.

It looks like Dick berg did it with the pulsed diode too:
http://www.physics.umd.edu/lecdem/services/demos/demosk8/k8-04.htm


And he cites these references:

Volker Thomsen, Precision and the Terminology of Measurement, TPT 35, 15-17 (1997). George W. Clark, An electrical measurement of the speed of light, AJP 69, 110-112 (2001). Burt Brody, The Speed Of Light: Making an Easy Time of It, TPT 41, 276-277 (2003).
Best,
- JZ

On Fri, Feb 11, 2011 at 12:44 PM, Doug
Johnson
wrote:


Does anyone have a Speed of Light Experiment that they would
recommend?? We
are seriously looking at the Pasco setup below. Your comments
would be
appreciated. ...Doug J

Basic Speed of Light Apparatus OS-9262

http://store.pasco.com/pascostore/showdetl.cfm?&DID=9&Product_ID=50688&group
ID=635&Detail=1







--
Gerald Zani
Demonstration Manager
Physics
Brown University
(401) 863-3964






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From tap-l-owner@lists.ncsu.edu Fri Feb 11 14:26:17 2011

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