A radioactive sample initially contains nuclei

PHYSICS · Single correct · CBSE · Physics · Nuclei · Nuclei

Problem

A radioactive sample initially contains 8.0×10208.0\times10^{20} nuclei. Its decay constant is 0.693 day−10.693\,\text{day}^{-1}. Calculate the approximate number of undecayed nuclei left after 33 days. (a) 2.0×10202.0\times10^{20} nuclei (b) 1.0×10201.0\times10^{20} nuclei (c) 0.50×10200.50\times10^{20} nuclei (d) 4.0×10204.0\times10^{20} nuclei

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