The amount y (in grams) of the radioactive isotope phosphorus-32 remaining after 1 days is y= a(0.5)14, where a is the initial amount (in grams). What percent of the phosphorus-32 decays each day? Round your answer to the nearest hundredth of a percent. The daily decay rate is about

Initially 100 milligrams of a radioactive substance was present. After 8 hours the mass had decreased by 4%. If the rate of decay is proportional to the amount of the substance present at time t, determine the half-life of the radioactive substance. (Round your answer to one decimal place.) hr

Approximate x to three significant figures.

The half-life of Carbon-14 is 11 years. How much of an initial 115 g sample will remain after 42 years? O 1.73 O 7628.40 O 1622.13 O 137.89 O 8.15

A radioactive substance is decaying at a constant yearly percentage rate of 6%. The initial amount is 444 grams. How much will remain after 13 years? Round your answer to two decimal places if necessary.

Find the associated half-life time or doubling time. (Round your answer to three significant digits.) Q = 1200e−0.025t th =

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