ECONOMICS
COMPOUND INTEREST
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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3.0g
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0.25mg
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0.3g
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0.25g
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Detailed explanation-1: -There will be 0.25 grams of strontium-90 remaining after 100 years.
Detailed explanation-2: -This is called one half-life. After 28.8 more years, strontium-90 has decayed to 25 grams. This is called two half-lives.
Detailed explanation-3: -How does strontium-90 change in the environment? Strontium-90 is not a stable isotope. Strontium-90 decays to yttrium-90, which in turn decays to stable zirconium. The isotopes of strontium and yttrium emit beta particles as they decay.
Detailed explanation-4: -Strontium-90 is a radioactive form of strontium. Strontium-90 is formed in nuclear reactors or during the explosion of nuclear weapons. The half-life of strontium-90 (the time it takes for half of the strontium to give off its radiation and change into another substance) is 29 years.
Detailed explanation-5: -Strontium-90 decays to yttrium-90 by emitting a beta particle, and yttrium-90 decays by emitting a more energetic beta particle with a half-life of 64 hours to zirconium-90.