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OpenStudy (anonymous):
PLEASE HELP DUE TOMORROW What is the half life of each of these radioactive isotopes? A) a radioactive isotope decreased to one-half its original amount in 18 months. B) a radioactive isotope decreased to one-fourth its original amount 100 years.
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OpenStudy (anonymous):
A half life is how long it takes for half the original radioactive material to decay
OpenStudy (anonymous):
please i need to determine wheter its a chemical or nuclear reaction occuring. A) when two compounds are combined heat is released. B) a sample of galllium-68 is reduced to one-half of its original amount in 68.3 minutes. C) Radium-226 decays to radon 222 D) A spark of energy is used to begin the combustion of methane gas. E) Hydrogen nuclei are fused in the sun to make helium atoms.
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