Question

A sample of polonium-210 has an initial mass of 390 milligrams (mg). If the half-life of polonium-210 is 36 days, how many mg of the sample remains after 72 days?

A.
392 mg

B.
195 mg

C.
97.5 mg

D.
48.75 mg

Answer 1

Answer: D. 48.75

Explanation: just took the test

Answer 2

Answer:

D

Explanation:

I got this question right on my test.