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Zeke,
For starters, the tuning fork is really bad at radiating sound energy.
They make almost no noise at a distance. The tube acts much like the body
of a stringed instrument in helping the motion of the string couple to the
air. Phones, on the other hand, would need to work hard to design a
speaker that transmits anything to the air.
Take a look at the 39 minute mark of this video:
https://www.youtube.com/watch?v=ADgihdzVSRY
As for the human perception of "amplitude increase" it may be related to
the logarithmic nature of human hearing. Ten times more energy in the
sound wave doesn't sound 10 times louder.
Paul
On Fri, Oct 28, 2022 at 2:03 PM Zeke Kossover via Phys-l <
phys-l@mail.phys-l.org> wrote:
Howdy Physicists!the
As a resonance activity, I bring a vibrating tuning fork towards a tube
that is open at one end and closed at the other. When tuned correctly,
air in the tube loudly resonates.louder
Since tuning forks are expensive and every student has a phone with a
speaker, I've tried running the activity with a frequency generated by
their phone. To my ears, the sound generated by their phones is way
than the tuning fork, but when I put the phone next to the tube, the_______________________________________________
amplitude increase is way less.
I wonder why they are so different. Do any of y'all have ideas?
--
*Marc "Zeke" Kossover | Educator, Teacher Institute*
zkossover@exploratorium.edu
Museum: Pier 15, San Francisco, CA 94111
Mailing: 17 Pier, Suite 100, San Francisco, CA 94111
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