A certain sample of a radioactive marerial decays at the rate of 500 per second at a cartain time .the count rate falls to 200 per second after 50 minutes .(a) What is decay constant of the sample? (b) what is its half-life?

A certain sample of a radioactive material decays at the rate of 500 per second at a certain time. The count rate falls to 200 per second after 50 minutes. (a) What is the decay constant of the sample ? (b) What is its half-life?

What fraction of a radioactive sample decay after three half lives?

What per cent of orginal radioactive sample decays after four half lvies

The decay contsnt of a radioactive substance is at the rate of 0.05 per hour. Calculate its half life and mean life .

Half-life of a radioactive sample is 200 days. Its decay constant is

A counter rate meter is used ot measure the activity of radioactive sample. At a certain instant the count rate was recorded as 475 counters per minute. Five minutes later, the count rate recorded was 270 counts per minute. Calculate the decay constant and half life period of the sample.

The radioactive decay rate of a radioactive element is found to be 10^(3) disintegration per second at a certain time . If the half life of the element is one second , the decay rate after one second is?

A radioactive sample has a half-life of 10 minutes. If 64 nuclei are contained in the sample the number of nuclei that would decay after 50 minutes is