Technetium - 99 has a half-life equal tO₆.0 hours. What fraction of Technetiun - 99 remains undecayed after 18 hours?

Question

Quizplus · Accepted Answer

We can use the formula for radioactive decay:

N = N0 * (1/2)^(t/t1/2)

where N is the remaining amount, N0 is the initial amount, t is the time elapsed, and t1/2 is the half-life.

Plugging in the given values, we get:

N = N0 * (1/2)^(18/6.02) = N0 * (1/2)^3 = N0 * 1/8

This means that only 1/8 of the Technetium-99 remains undecayed after 18 hours, so the answer is C.

Technetium - 99 Has a Half-Life Equal TO6