Radon has a half-life of about 1600 years. The Earth is
Chapter 30, Problem 14MCQ(choose chapter or problem)
Problem 14MCQ
Radon has a half-life of about 1600 years. The Earth is several billion years old, so why do we still find radon on this planet?
(a) Ice-age temperatures preserved some of it.
(b) Heavier unstable isotopes decay into it.
(c) It is created in lightning strikes.
(d) It is replenished by cosmic rays.
(e) Its half-life has increased over time.
(f ) Its half-life has decreased over time.
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