State the law of radioactivity and hence, show that `N=N_(0)e^(-lambda t)`.

State the law of radioactive decay. Plot a graph showing the number (N) of undecayed nuclei as a function of time (t) for a given radioactive sample having half life T_(1//2) . Depict in the plot, the number of undecayed nuclei at (i) t=3T_(1//2) and (ii) t=5T_(1//2) .

State and explain the laws of thermal conductivity and hence mention the SI unit of coefficient of thermal conductivity.

State Newton's second law of motion and hence derive F = Ma.

State radioactive decay law. Derive N=N_0e^(-lambdat) for a radioactive element

State (n + 1) rule.