A sample of a radioactive substance decayed to 96% of its original amount after a year. (Round your answers to two decimal places.) (a) What is the half-life of the substance? yr (b) How long would it take the sample to decay to 40% of its original amount? yr

a) The half life of the radioactive sample is 0.22 years.

b) It will take 0.16 years to sample to decay to 40% of its original amount.

Explanation:

a) Initial amount of radioactive substance =

Final amount of radioactive substance after 1 year=

Decay constant = k

Decaying of radio active sample follows first order kinetics:

Half life of the sample =

The half life of the radioactive sample is 0.22 years.

b)

Initial amount of radioactive substance =

Final amount of radioactive substance after t years=

Decay constant = k =

Decaying of radio active sample follows first order kinetics:

Solving for t:

t =  0.1587 years ≈ 0.16 years

It will take 0.16 years to sample to decay to 40% of its original amount.

coral.

explanation:

coral. many marine organisms that produce calcium carbonate shells or skeletons are negatively impacted by increasing co2 levels and decreasing ph in seawater.

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms