A radioactive substance has an initial mass of 100 grams, and its mass is reduced by 40% every 5 year. Which could be used to find the number of grams in the mass, y, that remains after x years?

Every 8 days a mass of a certain radioactive substance decreases to exactly one-half of its value at the beginning of the 8day period. If the initial amount of the radioactivce substance is 75 grams, which equation gives the number of grams in the mass, M,that remains after d days?

A radioactive substance has a mass of 16 mg and its half life is 25 years. The quantity of substance will remain to be disintegrated in 100 years is

A radioactive material has an initial mass of 16g . After 120 days it reduce to 0.5g .Half-life of the radioactive element is

A radioactive substance has a half-life of 1 year. The fraction of this material, that would remain after 5 years will be.

The breakdown of a sample of a chemical compounds is represented by the function p(n)=300(0.5)^(n) , where p(n) represents the number of millligrams of the substance that remains at the end of n years. Which of the following is true? I. 300 represents the number of milligrams of the substance that remains after the first year. II. 0.5 represents the fraction of the starting amount by which the substance gets reduced by the end of each year. III. Each year the substance gets reduced by one-half of 300.

A radioactive substance has a half-life of 1,700 years. Calculate the time taken for substance to reduce from one gram to one milligram.

A radioactive substance decays to 1/16 th of its initial mass in 40 days. The half life of the substance, in days, is?

A radioactive element with mass 8 gm and haslf life 100 second after 5 minute will reduce to -