Consider two different materials, A and B. The ratio of thermal conductivities is kA/kB = 13, the ratio of the densities is ρA/ρB = 0.045, and the ratio of specific heats is cp,A/cp,B= 16.9. The ratio of the thermal diffusivities αA/αB is
(a) 4882
(b) 17.1
(c) 0.06
(d) 0.1
(e) 0.03
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