It adds protons to atoms It adds electrons to atoms It adds neutrons to atoms It knocks electrons from atoms
A carbon counter A proton counter A Geiger-Muller tube A telescopic star tube
A population A species The whole environment Errors in measurement
Half the time a radioactive particle lives Twice the time a radioactive particle lives The time taken for half the radioactive nuclei to decay Half the time taken for radioactivity to finish
Using half-life to measure the age of things Using a radio to record the radioactivity of things Talking to your sweetheart on the radio Flirting on the internet
Carbon-14 Carbon-12 Carbon-10 Oxygen-14
Bone Wood Silk Metal