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Maybe the light is heating & expanding the can?
_______________________________________________________
Dennis Erickson
WA9FBC
Latin School & Chicago Sidewalk Astronomy Club
Chicago Section--International Dark-Sky Assn.
http://www.sidewalk-astronomy-club.com/chicago
http://www.darksky.org
Keep your Eye on the Sky!
On Apr 21, 2007, at 7:09 PM, Tony wrote:
I came across something interesting today with another physics_______________________________________________
teacher and I
thought some of you might know how or why this is happening.
Take an empty aluminum drink can and place a camera's strobe in
front of the
can. Face the light from the strobe at the can. Place the strobe
about 1/2 a
cm in front of the can. Charge and then trigger the camera strobe.
When the
flash occurs, you will hear a, "ting," sound from the can. The
question is
what is causing the sound?
If I move the strobe about 3 cm away from the can and triggered, no
sound is
heard from the can.
If I aim the strobe perpendicular from the can and trigger it, no
sound is
heard from the can.
If I place the strobe about 1/2 cm in front of the can can place
one sheet
of notebook paper between the strobe and can the sound is diminished.
If I place the strobe about 1/2 cm in front of the can can place
six sheets
of notebook paper between the strobe and can, no sound is heard.
If I place the strobe about 1/2 cm in front of the can can place a
piece of
manila folder between the strobe and can, no sound is heard.
If I try the flash from my digital camera I don't get any sound
under the
original working conditions. However my friend's digital camera
works and
well as my older (removable) camera strobe.
At first we thought it was an and emp from the capacitor in the
strobe's
firing circuit. (But, I don't have a faraday cage handy to test
this at the
moment.) But now that I've done the experiments, above, I'm not so
sure it
is an emp.
Any ideas or thoughts?
-Tony
--
Tony Wayne
Albemarle High School
physixdude@comcast.net
http://www.mrwaynesclass.com
-
Those who can, do.
Those who understand, teach.
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Forum for Physics Educators
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Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
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