When it is stationary, the half-life of a certain
Chapter 36, Problem 36.15(choose chapter or problem)
When it is stationary, the half-life of a certain subatomicparticle is T0. That is, if N of these particles are present at acertain time, then a time T0 later only N/2 particles will bepresent, assuming the particles are at rest. A beam carryingN such particles per second is created at position x = 0 ina high-energy physics laboratory. This beam travels alongthe x axis at speed v in the laboratory reference frameand it is found that only N/2 particles per second travel inthe beam at x = 2cT0, where c is the speed of light. Findthe speed v of the particles within the beam.
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