Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity) ____________________?
Correct answer: B. k
- A. 1/k
- B. k
- C. k2
- D. 1/k2
Explanation
Thermal diffusivity is given by α = k/(ρCp), so with density and heat capacity fixed it is directly proportional to thermal conductivity k. A higher k therefore allows heat to spread more rapidly through the material.
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