The count rate of a Geiger Muller counter for the radiation of a radioactive material of half-life `30` min decreases to `5 s^(-1)` after `2 h`. The initial count rate was

A radioactive material has half-life of 10 days. What fraction of the material would remain after 30 days ?

A radioactive material has half-life of 10 days. What fraction of the material would remain after 30 days ?

After an interval of one day , 1//16th initial amount of a radioactive material remains in a sample. Then, its half-life is .

After an interval of one day , 1//16th initial amount of a radioactive material remains in a sample. Then, its half-life is .

After an interval on one day 1//6th of the initial amount of a radioactive material remains in a sample. Then its half life is

The half-life of radioactive material is 3 h . If the initial amount is 300 g , then after 18 h , it will remain

The count rate of nuclear radiation coming from a radioactive sample containing ^128I varies with time as follows. Time t(minute): 0 25 50 75 100 Count rate R (10^9 s^(-1)): 30 16 8.0 3.8 2.0 (a) plot In (R_0//R) against t. (b) From the slope of the best straight line through the points,Find the decay constant lambda .(c ) Calculate the half-life t_(1//2).

The count rate of nuclear radiation coming from a radioactive sample containing I^128 varies with time as follows. Time t (minute): 0 25 50 75 100 Count rate R(10^9 s^(-1)) : 30 16 8.0 3.8 2.0 (a) plot In (R_0//R) against t. (b) From the slope of the best straight line through the points,Find the decay constant lambda .(c ) Calculate the half-life t_(1//2) .

The rate of disintegration of a radioactive substance falls from 800 decay//min to 100 decay//min in 6 hourse. The half life of the radioactive substance is :