1) If the activity of a purely radioactive sample of 55Fe is measured tobe 0.5 mCi. What is the number of nuclei of this isotope presentafter 5.4 years.2) 226Ra (t₁/2 = 1600 y) alpha decays to the 1st excited state of nucleus Xwith branching ratio 6% and alpha decays to the ground state of Xwith branching ratio 94%. Calculate the partial half-life for the firstmode transition (the one to the first excited state of X).3) Fill the missing and decide the type of decay in the followingdecays:a)Co* → [ ] +Cob) ¹50 [ ] + [] + ¹5N40c) 10K + [ ] 18Ard) 21 Po84e) ¹3 Be →>>2a + [ ]¹2Be + [ ]

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Answered: 1) If the activity of a purely…

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1) If the activity of a purely radioactive sample of 55Fe is measured to be 0.5 mCi. What is the number of nuclei of this isotope present after 5.4 years.