A sphere made of a radioactive isotope initially has a mass of 6.88 kg. The half-life of this isotope is 1.34 h, and it decays by β- emission. At the end of 2.68 h, what is the mass of this sphere?
A) 6.88 kg
B) 3.44 kg
C) 1.72 kg
D) 2.53 kg

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The Answer of A sphere made of a radioactive isotope initially has a mass of 6.88 kg. The half-life of this isotope is 1.34 h, and it decays by β- emission. At the end of 2.68 h, what is the mass of this sphere?
A) 6.88 kg
B) 3.44 kg
C) 1.72 kg
D) 2.53 kg

A Sphere Made of a Radioactive Isotope Initially Has a Mass