(a) The radioisotope 40K constitutes 0.0117% of naturallyoccurring potassium and has a half life of 1.28´109 years.Calculate the activity of a 1.00 kg sample of potassium chloride(KCl). You may assume that 40K is the only radioisotope present inthe sample. A mole of potassium chloride has a mass of 74.55 g
Hint: You will need to calculate the number of 40K atoms in thesample.Type or paste question here
(b) The plutonium batteries in Voyager 1 had a power output of470 W when the spacecraft was launched in 1977. After how manyyears following launch will the power output have dropped to 300W?
