Date: Wed Oct 28 09:45:33 2009 ** **Back to Contents ** ------------------------------------------------------------------------ **

Author: Sam Sampere

Subject: Re: c

Post:

I just watched your video and I don't see evidence of standing waves...

-----Original Message-----
From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of Dale E. Stille
Sent: Wednesday, October 28, 2009 9:20 AM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] c

Sammy,

Haven't made that array of neon light bulbs yet.....Ehhhh? You've had a
whole weekend....what the hell you waiting for. Then you could see them
darn standing waves.
See: http://faraday.physics.uiowa.edu/em/5N10.56.htm

Call me.

Dale :)





Sam Sampere wrote:
> I never did like that experiment. First, who says there are standing wave in a microwave? That could be true, but I've never seen proof. And wouldn't the hot spots be at lambda/2?
>
> I'd like her better if dad didn't screw up the physics ;)
>
> Later,
>
> Sam
>
> -----Original Message-----
> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of fletcher@physics.usyd.edu.au
> Sent: Wednesday, October 28, 2009 7:14 AM
> To: tap-l@lists.ncsu.edu; Kenn Lonnquist
> Subject: Re: [tap-l] c
>
>
> I want to enroll this future student
>
> http://www.youtube.com/watch?v=9O2Keu6o3i0
>
>
>
>
> Quoting Kenn Lonnquist :
>
>> Brian-
>>
>> I have done this using fairly fresh "mini" marshmallows, and I will
>> generally cover a whole plate with them. That way, when they do expand,
>> there is not much side-to-side motion. After melting a bit (i have not
>> waited for them to burn, but perhaps the marking is clearer then) I stop the
>> microwave and let them cool. As they cool, they settle back down, without
>> much horizontal shrinkage. Often, I can get within several percent from
>> these measurements.
>>
>> Kenn
>>
>> On Tue, Oct 27, 2009 at 5:20 PM, Brian Huang wrote:
>>
>>> Matt, or anyone else out there -
>>>
>>> I tried this the other day, but the marshmallows just blew up (inflated).
>>> I started to get some brown spots to measure, but since the marshmallow
>>> moved too, I was unable to get an accurate reading. I'd love to see your
>>> write-up. And, is there a specific type of marshmallow that works best?
>>>
>>> Thanks!
>>>
>>> Brian Huang
>>> Lafayette, CO
>>>
>>>
>>>
>>>
>>> On Fri, Sep 11, 2009 at 8:27 AM, Matt Lowry wrote:
>>>
>>>> Hi Sean,
>>>>
>>>>
>>>>
>>>> You can do it with a microwave oven rather simply by measuring the
>>>> distance between â??hot spotsâ?? on, say, a bed of marshmallows. That distance
>>>> is half of a wavelength, and the standard microwave oven operates at a
>>>> frequency of about 2.45 GHz. Multiply the wavelength by the frequency and
>>>> youâ??ve got the speed of light. I have my students do this every year, many
>>>> to within 5% of the actual value.
>>>>
>>>>
>>>>
>>>> If youâ??re interested, let me know and I can send you the writeup I give to
>>>> my students on how to make all the measurements.
>>>>
>>>>
>>>>
>>>> Cheers,
>>>>
>>>>
>>>>
>>>> Matt Lowry
>>>>
>>>> Lake Forest High School
>>>>
>>>> College of Lake County
>>>>
>>>> Illinois
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> *From:* tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] *On
>>>> Behalf Of *Lally, Sean
>>>> *Sent:* Friday, September 11, 2009 8:17 AM
>>>> *To:* 'tap-l@lists.ncsu.edu'
>>>> *Subject:* [tap-l] c
>>>>
>>>>
>>>>
>>>> Folks,
>>>>
>>>>
>>>>
>>>> Any good suggestions for measuring â??câ?? on the cheap?
>>>>
>>>>
>>>>
>>>> Sean
>>>>
>>>>
>>>>
>>>
>>
>> --
>> Kenneth Lonnquist
>> Assistant Coordinator, Introductory Physics Labs
>> KennLonnquist@gmail.com
>> 970.491.2540
>> Physics Department
>> Colorado State University
>>
>
>
>
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>
>



From tap-l-owner@lists.ncsu.edu Wed Oct 28 09:45:33 2009
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