(a) Define decay rate or activity of a substance. Show that the decay rate R of radioactive sample is related to the number of radioactive nuclei N at the some instant by the expression R = λN. (b) Calculate half life of 238U if 1 g of uranium emits 1.23 x 104 a-particles per second.
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The speed of casing decays of any substance due to various factor are called decay rate of substance
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