Consider a point source emitting a-particles and receptor of area 1 cm2 placed 1 m away from source. Receptor records any α-particle falling on it. If the source contains N0 = 3.0 × 1016 active nuclei and the receptor records a rate of A = 50000 counts/second, the decay constant is the form of × 10–7 S–1 Assume that the source emits alpha particles uniformly in all directions and the alpha particles fall nearly normally on the window. Find K.
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