half of the substance remains after 20 hours ... so that is the half-life
after 24 hr ... amount = 130 * (1/2)^(24 / 20)
A radioactive substance decays exponentially. A scientist begins with 130 milligrams of a radioactive substance. After 20 hours, 65 mg of the substance remains. How many milligrams will remain after 24 hours?
1 answer
1 answer