Question

Superman is in some ways a living solar battery; his cells absorb electromagnetic radiation from stars (like Earth's sun). The radioactivity of kryptonite possibly interferes with this process, driving the energy out of his cells in a painful fashion. Long term and high-level exposure to green kryptonite can be fatal to Superman. For this reason, Superman spends a significant amount of time studying kryptonite. He performs an experiment to determine its half-life. He begins with 1.5 mols of kryptonite atoms (9.03E23 atoms). After 15 years, he returns and finds that 5.85E23 kryptonite atoms still remain. What is the half-life of kryptonite?

24 years

242 years

9.7 years

220 years

267 years

Answer 1

Hope.

atoms -it N = Noe No=10 5 moles - 9003 x 1023 t= 15 q N = 5.85x10 23 atoms. ens t112= ? -dt N= No e 5.85x lot 23 15 V 9.03X1023 e - 150 =) e 5-85 15 ) 9.03 e 9.03 - 1.5436 5085 » 15.1 en (1-5436) = 0.434 ~1 - 0.434 0.02894 year! i5 Now, ty en a 0.693 À 23.9455 0.02894 years til ?? २५ years 24 yearis. life is CS Hance withalf CamScanher

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