The graph in figure shows how the count-rate $A$ of a radioactive source as measured by a Geiger counter varies with time $t.$ The relationship between $A$ and $t$ is : $($ Assume $ln\,\, 12 = 2.6)$
The graph in figure shows how the count-rate $A$ of a radioactive source as measured by a Geiger counter varies with time $t.$ The relationship between $A$ and $t$ is : $($ Assume $ln\,\, 12 = 2.6)$
- A
$A = 2.6 \,e^{-10t}$
- B
$A = 12 \,e^{-10t}$
- C
$A = 2.6 \,e^{-0.1t}$
- D
$A = 1.2 \,e^{-0.1t}$
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