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    Ans: 1
    How can rate of nuclear decay be equal to rate of formation of radioactive substance?

    Why can't option 2 be the answer? Please explain.

  • it is like, some other nuclei must be decay to form the required nuclei.
    suppose we are talking about nuclei name B and it is formed by decay of nuclei A so it can be possible that the formation rate of B = decay rate of B

    decay rate is (decay constantno. of nuclei at time t) as No is nuclei no. at t=0 but at any other time it will be different and suppose it is N.
    so now rate of decay = rate of formation
    N= a/λ

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