Experimental Evidence for Relativity (HSC SSCE Physics): Flashcards

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Experimental Evidence for Relativity
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Einstein's 2nd postulate about light speed

Constant & independent of source's motion

Supernova evidence for constant light speed

No effects observed showing speed depends on source

Muon mean lifetime in laboratory

2.2×1062.2 \times 10^{-6} s or 2.22.2 μs

Frisch & Smith mountaintop detector altitude

1907 m above sea level

Muon speed in Frisch & Smith experiment

0.995c0.995c

Classical prediction: muons reaching sea level (%)

5.5%

Relativistic prediction: muons reaching sea level (%)

74.8%

Gamma factor (γ\gamma) at v=0.995cv = 0.995c

γ=10\gamma = 10

Atomic clock precision

One second per hundred million years

Year of Hafele-Keating experiment

1971

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