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 =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.