Which means you have a choice, but you didn't put the choices into the computer, so I can't answer this without the extra information.
radioactive
high-speed atomic particles occur
In radiometric dating, the amount of a certain radioactive isotope in an object is compared with a reference amount. This ratio can then be used to calculate how long this isotope has been decaying in the object since its formation. For example, if you find that the amount of radioactive isotope left is one half of the reference amount, then the amount of time since the formation of the object would be equal to that radioactive isotope's half-life.
All radioactive isotopes are unstable and they decay to a stable isotope emitting particles.
When an isotope is unstable, it is said to be radioactive.
radioactive
This depends for each isotope.
constant half-life
radioactive
high-speed atomic particles occur
In radiometric dating, the amount of a certain radioactive isotope in an object is compared with a reference amount. This ratio can then be used to calculate how long this isotope has been decaying in the object since its formation. For example, if you find that the amount of radioactive isotope left is one half of the reference amount, then the amount of time since the formation of the object would be equal to that radioactive isotope's half-life.
All radioactive isotopes are unstable and they decay to a stable isotope emitting particles.
When an isotope is unstable, it is said to be radioactive.
The radioactive isotope is disintegrated in time and emit radiations.
The radioactive isotope is disintegrated in time and emit radiations.
when an isotope is it does not undergo radioactive decay
The half life of an isotope refers to the rate at which a radioactive isotope undergoes radioactive decay. Specifically, it is the amount of time it takes for half of a given sample of a radioactive isotope to decay.