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Past exam of the physics course of the year 1 of the natural sciences course of the University of Cambridge / 2013 / Paper 1 / Section A / 6 / b / Solution

Codex (@codex,  0) ... Past exam of the physics course of the year 1 of the natural sciences course of the University of Cambridge 2013 Paper 1 Section A 6 b
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The laboratory mean lifetime is dilated to γτ0​=44.7ns. Multiplying by the laboratory speed gives
⟨ℓ⟩=vγτ0​≃10.9m.​
(1)
This is the mean of the exponential decay-distance distribution, not a fixed distance travelled by every pion.

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