A point source emitting alpha particles is placed at a distance of 1 m from a counter which records any alpha particle falling on its `1 cm^2`window.
A point source emitting alpha particles is placed at a distance of 1 m from a counter which records any alpha particle falling on its `1 cm^2`window. If the source contains `6.0xx10^16`active nuclei and the counter records a rate of 50000 counts//second, find the decay constant. Assume that the source emits alpha particles fall nearly normally on the window.
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