IMG_8900

(0703 (o) o 1T ol k| 20:42 A radioactive substance has a continuous decay rate of 0.064 remain radioactive after 45 minutes? Round the answer to the answer. per minute. How many grams of a 150 gram sample will nearest tenth of a gram, and do not include the unit in your v/ Yes that's right. Keep it (1] .1} Answer Explanation Correct answers: 8.4 Substitute the given values into the formula: A(t) = Pe™t. Where P is the initial mass, , T is the continuous rate of decay, and ¢ is time. Note, the rate is negative because we are finding the rate of decay. Substitute P = 150, 7 — —0.064, and t = 45. A(t) = Pe™ = 150(-0064+45) _ g 4 The amount of substance remaining after 45 minutes is 8.4 grams.