c
\(\lambda \,\, = \,\,\,\frac{h}{p}\,\,........\,\,(1)\,\) સમીકરણ દર્શાવે  છે કે \({\rm{p}}\) ધટે તેમ \(\lambda \) વધે છે.

\(\therefore \,\,\lambda \,\, + \,\,\frac{{{\rm{0}}{\rm{.25}}}}{{{\rm{100}}}}\,\lambda \,\, = \,\,\frac{h}{{p\,\, - \,\,{p_0}}}\)

\(\,\,\therefore \,\,\frac{{100.25\,\lambda }}{{100}}\,\, = \,\,\frac{h}{{p\,\, - \,\,{p_0}}}\,\,........\,\,(2)\,\,\)

સમીકરણ \((2)\) અને \((1)\) નો ગુણોતર લેતાં,

\(\,\,\frac{{100.25}}{{100}}\,\, = \,\,\frac{p}{{p\,\, - \,\,{p_0}}}\)

\(\therefore \,\,\,100.25p\,\, - \,\,100.25\,{p_0}\, = \,\,100\,p\)

\(\therefore \,\,0.25\,p\,\, = \,\,100.25\,{p_0}\,\,\,\)

\(\therefore \,\,p\,\, = \,\,\frac{{100.25}}{{0.25}}\)  \(\therefore \,\,p\,\, = \,\,401\,{p_0}\)