Question: Two samples contain different radioactive isotopes. Is it possible for these samples to have the same activity? (a) Yes, if they have the same number

Two samples contain different radioactive isotopes. Is it possible for these samples to have the same activity?
(a) Yes, if they have the same number of nuclei but different half-lives.
(b) Yes, if they have different numbers of nuclei and different half-lives.
(c) Yes, if they have different numbers of nuclei but the same half-lives.
(d) No, because they can have different half-lives.
(e) No, because they can have different numbers of nuclei.

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