A. Create an element
B. Detect an element
C. Split an element
D. Irradiate an element
Correct Answer:
Option B – Detect an element
Explanation
Half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of radioactive material to decrease by one-half
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