1) What percentage of incident photon radiation passes through 5 mm of material whose absorption coefficient is 0.7 mm^-1? What is an absorption length? I am lost here. Any input ...some mathematical formula for the absoprtion coefficient.....would be a great help to me.(adsbygoogle = window.adsbygoogle || []).push({});

2) Why is the mean life of the [tex]\Delta ^{0}[/tex] only 10^-23 seconds while that of a [tex]\Lambda ^{0}[/tex] is 2.6 * 10^-10 seconds. HINT: think strengths and its relationship to decay rates. Now, I can show how to get 10^-23 seconds but cannot explain the reasoning behind the question.

James

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# Particle physics - absorption length

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