d
\({t_1}\, \propto \,\,\,\frac{{{{f}^2}}}{{{{\left[ {\frac{{f}}{2}} \right]}^2}}}\,\) અને \({t_2}\,\, \propto \,\,\,\frac{{{{f}^2}}}{{{{\left[ {\frac{{f}}{4}} \right]}^2}}}\,\,\,\,\,\,\,{t_1}\,\, = \,\,\frac{1}{{100}},\,\,{t_2}\,\, = \,\,\,?\,\,\,\) 

\(\frac{{{t_2}}}{{{t_1}}}\,\,\, = \,\,\,\frac{{16}}{4}\,\, = \,\,4\,\,\) અને \({t_2} = \,\,4{t_1}\,\, = \,\,\,\frac{4}{{100}}\,\,s\)