Question

The half-life of Palladium-100 is 4 days. After 16 days a sample of Palladium-100 has been reduced to a mass of 3 mg.

What was the initial mass (in mg) of the sample?

What is the mass 8 weeks after the start?

Answer 1

y = initial mass * ( 1/2) ^ ( t / halflife)

Answer 2

y = yo * ( 1/2) ^ ( t/4)

Answer 3

3= yo (1/2)^(16/4)

Answer 4

3/ ( .5^4) = initial mass

Answer 5

y = 48 * ( 1/2) ^ ( t/4)

Answer 6

16/4 = 4
3 * 2^4 = 3 * 16 = 48mg -- initial mass

8 weeks after the start = 8*7 = 56
56/4 = 14
48*(0.5)^14 ~ 0,002929688

*

Answer 7

thank you