Cobalt is a radioactive substance used in nuclear medicine. You are given an old souce of radioactive cobalt with 4.2 ng of cobalt-60 written on it to analyze. You determine that the present diation of this sample is 182 Bq. What is the Age of this source in years? What quantity, in grams, of cobalt-60 is left in this source?

The correct answer is c. hope this

Answer: 1.4 seconds which is the third optionexplanation: current is defined as the flow of charge per timetherefore, the equation that relates current, charge and time can be expressed as follows: i = δq / δtwhere: i is the current given = 1.8 ampereδq is the charge given = 2.5 coulombδt is the time required for the flow of the given charges to give the 1.8 ampere.substitute with the givens in the above equation to get the time as follows: 1.8 = 2.5 / δtδt = 2.5 / 1.8 = 1.38888 which is approximately 1.4 secondshope this was !