A  ${}^7\mathrm{Li}$ target is bombarded with a proton beam current of ${10}^{-4} \mathrm{A}$ for 1 hour to produce ${}^7\mathrm{Be}$ of activity $1.8\times {10}^8$ disintegrations per second.  Assuming that one ${}^7\mathrm{Be}$ radioactive nucleus is produced by bombarding 1000 protons. Half life of ${}^7\mathrm{Be}$ is ………….. (approx.)

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