My notes oask your tea the radioactive isotope of lead, pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.3 hours. if 1 gram of this isotope is present initially, how long will it take for 85% of the lead to decay? (round your answel to two decimal places.) hr

10.96 hours will take for 85% of the lead to decay.

Step-by-step explanation:

Suppose A represents the amount of Pb-209 at time t,

According to the question,

Let be the initial amount,

Since, the half-life of 3.3 hours.

Here,

By substituting the values,

the radius is 2 times the diameter.

step-by-step explanation:

2

step-by-step explanation: