There are three $$thermometers{one$$ in contact with the skin of the man, other in between the vest and the shirt and third in between the shirt and coat. The readings of the thermometers are $$30oC$$,$$25oC$$ and $$22oC$$, respectively. If the vest and the shirt are of the same thickness, the ratio of their thermal conductivities is

Question

Infinity Learn · Accepted Answer

Rate of flow of heat will be equal in both vest and shirt  ∴ Kvest A⋅Δθvest $$tl=Kshirt$$ AΔθshirt tl⇒ Kvest Kshirt $$=$$Δθshirt Δθvest ⇒Kvest Kshirt $$=25$$−$$2230$$−$$25=35$$

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