A500g sample of potassium-40 is left to decay radioactively. after 3.9 x 109 years, about how many grams of potassium-40 are expected to remain? [the half-life of potassium-40 is 1.3 x 109 years.]

energy stored in the capacitor= 9.72 x 10⁻⁴ j

explanation:

the energy stored in the capacitor is given by

e= 1/2 c v²

e= energy stored

c= capacitance= 1.5 µc= 1.5 x 10⁻⁶f

v= potential difference=36 v

so energy stored= e= 1/2 (1.5 x 10⁻⁶) (36)²

energy stored= 9.72 x 10⁻⁴j

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