Please provide full solutions (not just answers) 9. Imagine Superman is investig

Question

Please provide full solutions (not just answers)

9.

Imagine Superman is investigating the half-life of Krypton-8 and finds that it is approximately 10.8 years.
What fraction of the initial amount of Krypton-8 would still be remaining after 45 years?


(Hint: consider the initial amount of Krypton-8 as 100% or just the number 1 and round to three decimals places. For example: 43.57% = 0.436 for the actual answer

Consider that the half-life of Polonium-210 is 140 days.

10.

What approximate daily percentage of decay does Polonium-210 demonstrate?

(Round to two decimals.)
(Hint: use the Rule of 70 backwards by dividing by the half-life period instead of the rate.)

9.

Imagine Superman is investigating the half-life of Krypton-8 and finds that it is approximately 10.8 years.
What fraction of the initial amount of Krypton-8 would still be remaining after 45 years?


(Hint: consider the initial amount of Krypton-8 as 100% or just the number 1 and round to three decimals places. For example: 43.57% = 0.436 for the actual answer

Consider that the half-life of Polonium-210 is 140 days.

Explanation / Answer

9)

HL = 10.8 years

t = 45 years

apply hl equation

A = A0*(1/2)^(t/HL)

A/A0 = (1/2)^(45/10.8)

A/A0 = 0.0556

A = 0.0556*A0

that is the original fraction

10

HL = 140 days

210/70 = 3 % per day approx

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