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Question: 

The measured width of the $\Psi$ (3686) meson is about 300 keV. Estimate its mean life.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$2 \times 10^{-21} \textrm{ s}$

Giancoli 7th Edition, Chapter 32, Problem 28

(0:51)

Chapter 32, Problem 28 is solved.

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