Physics - Modern Physics Question with Solution | TestHub

By law of radioactive decay $$-\frac{\mathrm{dN}}{\mathrm{dt}}\propto \lambda \mathrm{N}$$ $\mathrm{N}$ is the number of radioactive nuclei in the sample So, $\frac{\mathrm{dN}}{\mathrm{dt}}$ can be negative The variation of decay rate with number of active nuclei is shown by the graph