The table below contains T_c values for different isotopically enriched samples of Sn and Hg. Assuming T_c ∝ M^−α , determine α in each case. Give a short explanation of why T_c depends on the isotopic mass. Sn data are from ref. [30]; Hg data are from ref. [6].

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Sn samples, mean atomic mass 113.58 T. (K) 3.8082 Hg samples, mean atomic mass T. (K) 199.7 4.161 116.67 118.05 3.7708 3.7442 200.7 4.150 202.0 4.143 119.78 123.01 118.7 3.7419 3.7238 3.6651 203.4 4.126