From: Geoff Ruth (gruth@leadershiphigh.org)
Date: Wed Mar 30 2005 - 17:45:03 PST
Message-Id: <p0611043abe71056ad9cf@[192.168.1.158]> Date: Wed, 30 Mar 2005 17:45:03 -0800 From: Geoff Ruth <gruth@leadershiphigh.org> Subject: Re: pinhole electron accelerator example
Hi Algis,
It seems to me like what you're describing is a cathode ray tube?
I remember reading once about someone who put up a Geiger counter up
next to an old classroom cathode ray tube, like the kind you see in
chem/physics textbooks. The radiation reading was WAY high on the
Geiger counter. I'm not sure how you'd do this experiment in a way
that students could both see and be shielded from fast e- (which I
think is the same as beta radiation).
- Geoff
>Hi pinholers.
>
>I'm always a bit frustrated that most AP physics textbooks spend a
>lot of time developing the concept of charges accelerated in
>electric fields (in a vacuum) which can be very abstract for a
>student.
>
>When I was reading over a Project Physics textbook from 1970, it
>refers to an experiment that students did: "you can make such an
>electron gun yourself in the laboratory experiment Electron Beam
>Tube." Has anyone done this from years past? Are there any simple
>ways to do this?
>
>I figure one needs a high voltage power supply which I have. I'm
>really looking more for an example than an experiment for students
>to do themselves.
>
>Thanks,
>
>Algis Sodonis
>The Urban School of SF
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