Question

please help
Suppose a laboratory has a 57 g sample of polonium-210. The half-life of polonium-210 is about 138 days.
a. How many half-lives of polonium-210 occur in 276 days?
b. How much polonium is in the sample 276 days later?

2; 3,933 g
2; 14.25 g
2; 28.5 g
3; 7.13 g

Answer 1

2

Answer 2

got that but how do u figure out the rest

Answer 3

half of a half of the original amount

Answer 4

2 half lives means you cut it in half, then half again.

Answer 5

\[57 * \frac{ 1 }{ 2 } * \frac{ 1 }{ 2 }\]

Answer 6

The half life is 138 days, so in 276 days, 2 half lifes will occur, and the sample will be 1/4 th the original size.

Answer 7

or 14.25 g

Answer 8

b would be my answer