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# What is the half-life of bismuth-210 if 9.41 days are required for the mass of a sample of bismuth-210 to fall to 27.2 percent of its original value?...

What is the half-life of **bismuth-210** if **9.41 days** are required for the mass of a sample of **bismuth-210** to fall to **27.2** percent of its original value? Since the decomposition is a radioactive decay reaction, it is first order.

**_________days**