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Einstein’s Theory of Special Relativity PowerPoint Presentation

Einstein’s Theory of Special Relativity

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Einstein’s Theory of Special Relativity

- Special – different frames of reference moving at high velocities relative to each other with no acceleration(s).

Einstein’s Theory of Special Relativity

- Law #1 – the laws of physics are the same in all non-accelerating reference frames.
- Law #2 - the speed of light ( c ) is the same in all non-accelerating reference frames.

Einstein’s Theory of Special Relativity

- Time dilation
- Length contraction
- Loss of simultaneity

Einstein’s Theory of Special Relativity

- ( Β ) = v/c
- ( γ ) = 1 / (1-(Β2)) ½

Time dilation t’ = γ t

Time dilation

- Your spouse was born on the same day as you.
- He/She leaves on a voyage to the star Tau Ceti
- The distance to Tau Ceti is twelve light years.
- The ship will travel at an average speed of .98c there and back again.
- The ship will explore the star system for one (earth) year.
- How much older will you be when your spouse returns?
- How much older will your spouse be?
- What will be your age difference?

Length contractionL’ = Lo / γ

- A runner goes past you with velocity of .85c holding a pole with a proper length of 20 meters.
- What length do you measure the pole?
- How long does the pole appear to the runner?

Length contractionL’ = Lo / γ

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