Re: High school experiment examining particle-wave duality?
- From: "PD" <TheDraperFamily@xxxxxxxxx>
- Date: 23 Oct 2006 12:35:13 -0700
Coyn wrote:
For a (relatively large) high school project, I would like to examine
particle-wave duality. I was wondering what experiments I could do to
this effect.
Ideally, I would love to look at the wave nature of the electron. An
electron ray shouldn't be too hard to come by (can I effectively get
one out of an old CRT monitor?), but is it feasable to send the
electron ray through a grating and see interference patterns? I
suppose that vacuum is needed for this, as well as something
(photographic?) which can detect the trace of the electrons on the
other side of the grating. According to de Broigle, the wavelength L
of an electron is something like mc^2=hc/L => L = hc/(mc^2) = h/mc=
2.42 pm. Is it even possible to get a grating fine enough to produce
any diffraction? Any tricks that can be used? Or any other experiments
you can suggest?
Thanks in advance
Coyn
Electrons are tough, because the wavelengths are typically very short.
Light is easier.
Here you can use Young's disk experiment (bright spot in the middle,
counter to particle model) for the wave picture, and the photoelectric
effect (independence of ejected electron KE from intensity of incident
light, and other things) for the particle picture.
PD
.
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