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Figure 4 shows two identical balloons A and B. The balloons were filled with equal amounts of the same type of gas. The balloons are suspended at a distances #x_1# and #x_2# from a metal cube filled with boiling water and placed on an insulating material.
The face of the cube towards A is bright and shiny and the face towards B is dull black. State with reason the adjustments that should be made on the distances #x_1# and
#x_2# so that the rate of change of temperature in both balloons is the same.