Q: How is the radioactive decay measured?


Read this paragraph and choose the correct option from the provided answers:

The rate of radioactive decay varies from one radioisotope to another. The rate is measured by the half-life. This is the length of time it takes for half of a given amount of a radioisotope to decay.

 Choices:

- carbon dating

- quarter-life

- alpha emission

- half-life


A:
half-life