Use the exponential decay equation given below, where A is the amount of a radioactive material present after time t, k is the half-life of the radioactive material, and A0 is the original amount of radioactive substance.

Iodine-131 is an isotope that is used to study the functioning of the thyroid gland. This isotope has a half-life of approximately 8 days. A patient is given an injection that contains 8 micrograms of iodine-131. (Round your answers to one decimal place.)
(a) What will be the amount of iodine in the patient after 15 days?
A = micrograms

(b) How long (in days) will it take

Question

Use the exponential decay equation given below, where A is the amount of a radioactive material present after time t, k is the half-life of the radioactive material, and A0 is the original amount of radioactive substance.

Iodine-131 is an isotope that is used to study the functioning of the thyroid gland. This isotope has a half-life of approximately 8 days. A patient is given an injection that contains 8 micrograms of iodine-131. (Round your answers to one decimal place.)
(a) What will be the amount of iodine in the patient after 15 days?
A =   micrograms

(b) How long (in days) will it take