The half-life of Po-210 is 140 days. If the initial mass of the sample is 5 kg, how much will remain after 420 days.

0.625kg

Step-by-step explanation:

an equation can be made given by the detials of the problem

f(n)=5(0.5)^(x/140)

where x is the amount of days

plug in 420 for x to get

0.625

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