Author Question: Plutonium has a half life of 2.4 104 years. How long does it take for 99 of the plutonium to decay? ... (Read 76 times)

Tazate · **on:** Jul 27, 2018

Plutonium has a half life of 2.4 104 years. How long does it take for 99 of the plutonium to decay?

A) 1.6 106 y
B) 1.6 105 y
C) 1.6 104 y
D) 1.6 103 y
E) 1.6 102 y

Question 2

A radioactive substance with a half-life of 3 days has an initial activity of 0.24 Ci. What is its activity after 6 days?

A) 0.48 Ci
B) 0.02 Ci
C) 0.06 Ci
D) 0.23 Ci
E) 0.12 Ci