A solid sphere and a hollow sphere of same material have same mass. When they are heated by 50°C, increase in volume of solid sphere is 5 c.c. The expansion of hollow sphere is

Volume V =$\frac{4\pi }{3}{r}^3$

Also due to a rise in temperature Δt , final radius rt =r₀ (1+αΔt)

Since the spheres have same mass and they are made of same material , the hollow sphere has larger radius. Hence its expansion will be more.