• # question_answer The quantities of heat required to raise the temperature of two solid copper spheres of radii ${{r}_{1}}$ and ${{r}_{2}}\text{ (}{{r}_{1}}=1.5\text{ }{{r}_{2}})$ through 1 K are in the ratio:               [NEET 2020] A)  $\frac{9}{4}$              B)       $\frac{3}{2}$ C)  $\frac{5}{3}$              D)       $\frac{27}{8}$

 [d] $\Delta Q=ms\Delta T$ $\Delta Q=\frac{4}{3}\pi {{r}^{3}}\rho s\Delta T$ $\frac{\Delta {{Q}_{1}}}{\Delta {{Q}_{2}}}={{\left( \frac{{{r}_{1}}}{{{r}_{2}}} \right)}^{3}}$ $={{(1.5)}^{3}}$ $=\frac{27}{8}$