170- Two spheres of the same metal type A and B, with outer radius $20\,\text{cm}$ and inner radius $20\,\text{cm}$, and the inner cavity radius of B is $10\,\text{cm}$. If we heat both spheres by the same amount of temperature, and the change in volume of sphere A is $\Delta V_A$ and the change in volume of metal in sphere B is $\Delta V_B$, which of the following is the ratio $\dfrac{\Delta V_A}{\Delta V_B}$? $\dfrac{\gamma}{\lambda}$ (1) $1$ (2) $2$ (3) $\dfrac{\lambda}{\gamma}$ (4)
\textbf{170-} Two spheres of the same metal type A and B, with outer radius $20\,\text{cm}$ and inner radius $20\,\text{cm}$, and the inner cavity radius of B is $10\,\text{cm}$. If we heat both spheres by the same amount of temperature, and the change in volume of sphere A is $\Delta V_A$ and the change in volume of metal in sphere B is $\Delta V_B$, which of the following is the ratio $\dfrac{\Delta V_A}{\Delta V_B}$?
\hfill $\dfrac{\gamma}{\lambda}$ (1) \hfill $1$ (2) \hfill $2$ (3) \hfill $\dfrac{\lambda}{\gamma}$ (4) \hfill