[asa] Easy to show experiments

On another subject entirely, I'm interested in showing to young
elementary age children that

(1) Atoms exist
(2) Light is a wave
(3) Light is a particle

I have found a very simple way to demonstrate (2) -- look at a light
source through the separation of two fingers (my baseball scarred fingers
are especially good for this purpose). As the fingers come together, dark
lines appear between them -- it is usually easy to see at least three of
these. The wave argument follows.

I have heard somewhere that an equally easy way to demonstrate (1) exists
but I have not been able to find it. All the ways to show (3) seem to
require experimental setups.

Any ideas?

Burgy

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Received on Tue Sep 11 17:18:01 2007