In a series of experiments, block B is to be placed in a thermally insulated container with block A, which has the same mass as block B. In each experiment, block B is initially at a certain temperature TB, but temperature TA of block A is changed from experiment to experiment. Let Tf represent the final temperature of the two blocks when they reach thermal equilibrium in any of the experiments. Figure gives temperature Tf versus the initial temperature TA for a range of possible values of TA, from TA1 = 0 K to TA2 = 500 K. The vertical axis scale is set by Tf = 400 K. What are(a) Temperature TB and(b) The ratio cB/cA of the specific heats of theblocks?

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T TẠI A2 T, (K)