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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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