The rate of disintegration of a radioactive sample is R and the number of atoms present at any time t is N . When R N is taken along Y -axis and t is taken along X -axis, the correct graphs is

Step-by-step solution

Law of radioactive decay is given as, d N d t =- N where, d N d t = rate of disintegration So, R=- N R N =- = constant where, = decay constant So, the graph R N versus t is as, So, the correct graph shown in option (d).