which radioactive isotope would have the longer half- life ¹⁵O or ¹⁹O? (given rate constants for ¹⁵O and ¹⁹O are 5.63x 10-³ s-¹ and k = 2.38 x 10-² s-¹ respectively)
a. ¹⁵O
b. ¹⁹O
c. both will have the same half-life
d. none of the above