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Q.

The ratio of coefficient of thermal conductivity of two different materials is 4:9. If the thermal resistance of rods of same thickness of these material is same, then what is ratio of length of these rods -

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a

25:9

b

3:5

c

9:25

d

 4:9

answer is B.

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Detailed Solution

As R=LKA⇒L1K1A1=LK2A2⇒L1L2=K1K2=49

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The ratio of coefficient of thermal conductivity of two different materials is 4:9. If the thermal resistance of rods of same thickness of these material is same, then what is ratio of length of these rods -