Calculate the mass of a sample of pure {^{40}_{19} K } with an initial decay rate of 2.4 x 10^5 s ^{-1}. The half-life of {^{40}_{19} K } is 1.248 x 10^9 yr .

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Calculate the mass of a sample of pure 1940K{^{40}_{19}\textrm{K}}1940​K with an initial decay rate of 2.4×105 s−12.4 \times 10^5 \textrm{ s}^{-1}2.4×105 s−1. The half-life of 1940K{^{40}_{19}\textrm{K}}1940​K is 1.248×109 yr1.248 \times 10^9 \textrm{ yr}1.248×109 yr.

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Calculate the mass of a sample of pure ${^{40}_{19}\textrm{K}}$ with an initial decay rate of $2.4 \times 10^5 \textrm{ s}^{-1}$ . The half-life of ${^{40}_{19}\textrm{K}}$ is $1.248 \times 10^9 \textrm{ yr}$ .