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ejectile
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Tue Apr 24 2001 at 5:17:21
"Ejectile" is a shorthand combination of
projectile
and
eject
commonly used in
physics
, especially physics where something's hit by something else and yet another thing (otherwise it'd be simpler to keep calling it the projectile) goes flying off. (or I suppose it could be used anyplace something's ejected
ballistic
ally. So much for completely avoiding
Freud
.)
Ok, so that didn't make much sense.
To demonstrate the concept a little more competently, a concrete example is in order.
If you can call
nuclear particles
concrete... after all, the
liquid drop model
works fairly well.
Let's let A(p,a)B be a nuclear reaction. In order: A's a nucleus. It's just innocently sitting there, not unlike a
deer in headlights
, when a
beam
of p - which we'll suppose are
protons
just to have something that actually begins with "
p
" - comes flying in. Some of the
proton
s get absorbed into the nucleus and knock off "a" particles - let's call them
alpha
s. So the
alpha particle
s go flying off, leaving behind a somewhat modified nucleus which can no longer properly be called
A
-- it's a different element, since the number of protons has changed. So let's call it
B
.
Ok, now take a step back. What was the
ejectile
here? The
alpha
s. It couldn't have been anything else. A and B didn't move - at least no more than recoil made them, and they're probably big compared to the protons or alphas. (aka
recoil
doesn't do much. like
Earth
doesn't move much when you jump up and down.) And the
proton
s? They were incoming, not
ejected
- so they were the projectiles! Et
voila
- process of elimination in action. Any process on any scale that is analogous to this one can be labeled similarly.
While I understand that this is probably way over-explained for most of you, it's a nice change from the level of the lecture I sat through this morning.
Indulge
me!
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chaos
eject
The Nuclear Physics Project
Nuclear Physics
projectile
Indulge
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