\({N_1} = {N_0}{e^{ - (15\,x) \times \frac{1}{{6\,x}}}} = {N_0}{e^{ - \frac{5}{2}}}\)

બીજા રેડિયો એક્ટિવ તત્વ માટે ,

\({N_2} = {N_2}{e^{ - (3x) \times \frac{1}{{6x}}}} = {N_0}{e^{ - \frac{1}{2}}}\) તેથી

\(\frac{{{{\text{N}}_{\text{1}}}}}{{{{\text{N}}_{\text{2}}}}} = \frac{{{N_0}{e^{ - \frac{5}{2}}}}}{{{N_0}{e^{ - \frac{1}{2}}}}}\)

\( = {e^{ - \frac{5}{2}}} \times {e^{\frac{1}{2}}} = {e^{ - 2}} = \frac{1}{{{e^2}}}\)