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.

Question

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.

anonymous · Answer

A half life is how long it takes for half the original radioactive material to decay

anonymous · Answer

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.