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David & lily's ispi presentation
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Transcript of David & lily's ispi presentation
Invariant speed of Light—second postulate of special
relativity
David
Lily
P
Proton,Photon,Pion,Physics,...
[ ] Ding
Light speed is...constant ?
Suppose :A proton is running at 99% of the light speed. Its n
ame is Poppy
1
A beam of light passes by Pop
py
2
As observers, we see Poppy goes almost
as fast as light
3
However, Poppy feels
that light goes as fast as it used to be
4
P
Assumption: one fixed star emits two types of light with differe
nt speed----c and C (c>C)
Because c and C are both constant, observer can receive them
at the same time.
As a result, c and C didn't depart simultaneously from the star.
StellarAberration
If the difference is 13 m/s,
1
the star, which is 30 lower light yr far away, will exist at the same time BOTH at site A and B where the angular distance is 10'.
2
If the star light is changing constantly in the range C~c,
3
the star should look like a LINE which is 10' long.
4
But this line is never seen,
5
so...6
Conclusion
Lorentz Transformation (1892-1904)
in order to explain the baffling outcome of the 1887 ether-wind experiment of Michelson and Morley. In 1892, Lorentz independently FitzGerald-Lorentz contraction hypothesis
How Lorentz Transformation worksInvariance of speed of light (Second Postulate of Special Relativity):
For two events A and B(x1,x2,x3,t) and (y1, y2, y3, s) on one inertial reference frame M, and (x1’, x2’, x3’, t’) and (y1’, y2’, y3’, s’) on another inertial reference frame N
---->space-time interval is invariant
Mysteries and Further development
1. EPR paradox2. Gravity, General Relativity,
and Black Hole3. Relationship between light
and space&time