Problem: The radioactive isotope 19O, prepared by neutron irradiation of  19F, has a half life of 29 s. What percentage of a freshly prepared sample of 19O remains after 2.00 min? (a) 4.5% (b) 25% (c) 5.7% (d) 18% (e) 69%

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The radioactive isotope 19O, prepared by neutron irradiation of  19F, has a half life of 29 s. What percentage of a freshly prepared sample of 19O remains after 2.00 min?

(a) 4.5%

(b) 25%

(c) 5.7%

(d) 18%

(e) 69%