102 Chapter 3
For example, when an electron
and positron coide, they are
aihilated and become light.
But What is a
positron?
A positron is the
antiparticle of an
electron.
Gaa Ray Photon
(
E = 8.19 × 10
-14
J)
Gaa Ray Photon
(
E = 8.19 × 10
-14
J)
Aihilation!
Positron
(mc
2
= 8.19 × 10
-14
J)
Electron
(
mc
2
= 8.19 × 10
-14
J)
Its ma and other
properties are the
same as those of an
electron...
but it caies positive
charge while the
electron caies
negative charge.
Huh...
RELATIVITY_03.indb 102 3/15/2011 3:27:19 PM
The Faster an Object Moves, the Shorter and Heavier It Becomes? 103
When a particle and
antiparticle such as an
electron and positron
coide, they are
aihilated.
This phenomenon
is caed pair
aihilation.
When a particle and
antiparticle coide,
they completely
vanish?
Antiparticle
Particle
They don't just
"vanish." they are
changed into the
equivalent amount
of energy.
The ma of the
aihilated electron and
positron is converted
to energy aording to
E = mc
2
to produce...
...high energy
electromagnetic
rays having exactly the
same energy.
Particle
Antiparticle
I s!
RELATIVITY_03.indb 103 3/15/2011 3:27:20 PM
104 Chapter 3
Hm...I fl like
I understand it
more now.
pant pant
pant
Hey! Isn't that the
Vice Principal?
He went over
there.
He lked reay
hot, didn't he?
Mi
Uraga...?
Is he gone yet?
Omigod! You
lk crazy
hiding like that.
If he saw us, it would
be awful since we're
studying at the pl!
I don't reay
care...
pant
pant
pinch
pant pant
pant
splish
RELATIVITY_03.indb 104 3/15/2011 3:27:21 PM
The Faster an Object Moves, the Shorter and Heavier It Becomes? 105
Ah?!
Aah...
Huh? We mt again...
to say that...
why are you in
the pl?
Um...
I'm...in the
swiing
club...
Ah...
If that's the
case...what the...!
Don't lie with a
smiling face!
Is she one of
our students?
splash
yikes!
RELATIVITY_03.indb 105 3/15/2011 3:27:22 PM

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