Question: An experiment needs an almost monochromatic K + beam with momentum p = 2 GeV. We obtain it by building a magnetic spectrometer and a

An experiment needs an almost monochromatic K+ beam with momentum p = 2 GeV. We obtain it by building a magnetic spectrometer and a system of slits. However, the total length of the beam is limited by the lifetime of the K+. At what distance is the K+ intensity reduced to 10% of the initial value?

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