How much of a radioactive substance must be presented to decay to 80 grams in 12 years if the half-life of the substance is 7.6

Question

2 years ago

10

years?

2 answers:

elena-s [515] · Answer 1 · 2023-04-11T16:14:53+03:00

8 0

Answer:

239 grams.

Step-by-step explanation:

Half life t(1/2) = ln 2 / k

So 7.6 = ln 2 / k

k = ln 2 / 7.6 = 0 0901204

N = No e^-kt

So after 12 years

80 = No / e^(-0.0901204*12)

No = 80 / e^(-0.0901204*12)

= 239.

max2010maxim [7] · Answer 2 · 2023-04-11T14:13:50+03:00

4 0

Answer:

Radioactive in half life is 51gram

Step-by-step explanation:

80grams:12years

X :7.6years

12x÷x=x

7.6×80÷12=51gram