c
\( {\text{P}} = \frac{{\text{1}}}{{\text{3}}}\frac{M}{V}C_{rms}^2\,\, \Rightarrow \,\,\,\frac{{{P_2}}}{{{P_1}}} = \frac{{{M_2}}}{{{M_1}}}{\left( {\frac{{{C_2}}}{{{C_1}}}} \right)^2}\)
\(\frac{{{P_2}}}{{{P_1}}} = \frac{M}{{2M}}{\left( {\frac{{2C}}{C}} \right)^2} = 2 \Rightarrow \,{P_2} = 2{P_0}\)