Answer :
Hi there, thanks for asking a question here on Brainly. The name for the average time needed for half the nuclei in a sample of a radioactive substance to undergo radioactive decay is half-life.
Answer: Letter A ✅
Hope that helps! ★ If you have further questions about this question or need more help, feel free to comment below or leave me a PM. -UnicornFudge aka Nadia
Answer: Letter A ✅
Hope that helps! ★ If you have further questions about this question or need more help, feel free to comment below or leave me a PM. -UnicornFudge aka Nadia