Atoms and Nucle...

The count rate of 10 g of radioactive material was measured at different times and this has been shown in the figure. The half life of material and the total counts (approximately) in the first half life period, respectively are

The fraction f of radioactive material that has decayed in time t, varies with time t. The correct variation is given by the curve

The plot of the number (N) of decayed atoms versus activity (A) of a radioactive substance is

If in hydrogen atom, radius of n^th Bohr orbit is r_n, frequency of revolution of electron in n^th orbit is f_n, choose the correct option

The graph between the instantaneous concentration (N) of a radioactive element and time (t) is

In figure X represents time and Y represents activity of a radioactive sample. Then the activity of sample, varies with time according to the curve

The graph which represents the correct variation of logarithm of activity (log A) versus time, in figure is

The charge density in a nucleus varies with distance from the centre of the nucleus according to the curve in figure

The curve between the activity A of a radioactive sample and the number of active atoms N is

The graph between number of decayed atoms N\' of a radioactive element and time t is