\(\, \Rightarrow \,\,\,t\,\, = \,\,\frac{M}{P}\,\, \times \,\,\frac{{{N_A}}}{{{M_\omega }}}\,\, \times \,\,200\,\, \times \,\,1.6\,\, \times \,\,{10^{ - 13}}\)
\(\therefore\) \(\,t\,\, = \,\,\frac{{1\,kg}}{{100\,\,W}}\,\, \times \,\,\frac{{6\,\, \times \,\,{{10}^{23}}}}{{235\,\, \times \,\,{{10}^{ - 3}}kg}}\,\, \times \,\,200\,\, \times \,\,1.6\,\, \times \,\,{10^{ - 13}}\,J\,\)
\( \approx \,\,\,8.17\,\, \times \,\,{10^{11}}\,s\,\,\, \approx \,\,2.5\, \times \,\,{10^4}\,\) વર્ષ