A sample of a radioactive isotope contains N nuclei at time t.At time `(t+triangle t)`,it contains `(N-triangleN)` nuclei of the isotope.
For the period `trianglet`,state in terms of `N,triangle N` and `trianglet`,
the probability of decay of a nucleus.

A sample of a radioactive isotope contains N nuclei at time t.At time (t+triangle t) ,it contains (N-triangleN) nuclei of the isotope. For the period trianglet ,state in terms of N,triangle N and trianglet , the mean activity of the sample

A radioactive substnce havig N nuclei has activity R.Write down an expressin for its half-life in terms of R and N.

There are two radio nuclei A and B is a alpha -emitter and B is beta -emitter. Their disintegration constant are in the ratio of 1:2 . What should be the number of atoms ratio of A and B at time t=0 , so that initially probability of getting of alpha and beta -particles are same.

State the law of radioactive decay, If N_0 is the number of radioactive nuclei in the sample at same initial time, find out the relation to determine the number N present at a subsequent time. Draw a plot of N as a function of time.

Radioactive element A are being produced at a constant rate alpha . The element has a decay constant lambda . At time t=0, there are N_0 nuclei of the element. Calculate the number of nuclei A at time t.

Show that decay rate R of a sample of a radio-nuclide is related to the number of radioactive nuclei N at that instant by the expression R=lambdaN .

There are two radioactive substances A and B. Decay constant of B is two times that of A. Initially both have equal numbr of nuclei. After n half lives of A, rate of disintegration of both are equal. Find the value of n.

Who proved semiconservative mode of DNA replication for the first time in E. Coli with the help of N^15 heavy nitrogen isotope?

If N is the population density at time t,then what would be density at time (t+1) ? Give the formula.