The half-life of a radioactive isotope is 140 d. How many days would it take the decay rate of a sample of this isotope to fall to one-fourth of its initial value?
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Skinnytaste One and Done: 140 No-Fuss Dinners for Your Instant Pot®, Slow Cooker, Air Fryer, Sheet Pan, Skillet, Dutch Oven, and More: A Cookbook: Homolka, Gina, Jones R.D., Heather K.: 9781524762155: Amazon.com: