The isotope A has a half-life of 165 days. The isotope B has a half-life of 330 days. Which statement about these two isotopes is false? a) One year represents slightly more than two half-lives of a sample of the calcium isotope.

b) Almost all of 100 g of the calcium isotope will decay in one year's time.

c) 100 g of the vanadium isotope will decay to somewhat less than 50 g in a year.

d) The calcium isotope decays at twice the rate of the vanadium isotope.

e) All of these statements are true

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