Physics for IGCSE & O level - Atoms And Radioactivity (Section 2 - No. 41)
Which statement best describes a radioactive half-life?
The time it takes for a radioactive atom to completely decay.
The time it takes for half of the radioactive atoms in a sample to decay.
The time it takes for the mass of a radioactive sample to double.
The time it takes for the radiation emitted by a sample to become harmless.
Explanation
Half-life is the time required for half of the radioactive atoms in a sample to decay.
Comments (0)
