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Question

Find the case where heat flow can take place in between the two bodies. Given are the temperatures of both the bodies, measured with two different scales.

A
Body A : 0 °CBody B : 273 K
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B
Body A : 37 °CBody B : 98.6 °F
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C
Body A : 100 °CBody B : 212 °F
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D
Body A : 10 °CBody B : 212 °F
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Solution

The correct option is D Body A : 10 °CBody B : 212 °F
Heat flows from a body at a higher temperature to a region at lower temperature. When there is no difference in temperatures, no heat flow will take place. We know the following conversion of scales,
F =(C × 95 ) + 32C = (F32) × 59K = C + 273
Using these formulae we get,
(a) 0 °C = 273 K ( Melting point of ice )(b) 37 °C = 98.6 °F ( Normal body temperature )(c) 100 °C = 212 °F ( Boiling point of water )
but
(d) 10 °C = 50 °F since, F = 9/5 ( ° C) + 32 F = 9/5 × 10 + 32 F = 50 °F Since the temperatures are not equal in this case. Heat flow happens from body B and A.

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