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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferEasy2 min

PhysicsEasysingle choice

Two rods of equal length and equal cross-section have their ends at the same two temperatures. One is copper ( $k = 400$ W $m^{- 1}$ $K^{- 1}$ ) and the other is iron ( $k = 80$ ). Find the ratio of the rate of heat flow in the copper rod to that in the iron rod.

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Answer:

Solution:

$\frac{Q}{t} = \frac{k A Δ T}{l}$ . With $A$ , $l$ and $Δ T$ the same, the ratio is $\frac{400}{80} = 5$ . Density and specific heat play no part. C.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

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