Q141 / 150 · MHT CET 2020 (12 Oct Shift 1) · Physics

The variation of decay rate with number of active nuclei is correctly shown in graph

A
D
B
C
Correct answer
C
A
D
B

Solution

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

Hence, the correct answer is option: 'C'.

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