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The ratio of thermal conductivity of two...

The ratio of thermal conductivity of two rods of different material is `5 : 4`. The two rods of same area of cross-section and same thermal resistance will have the lengths in the ratio

A

`4:5`

B

`9:1`

C

`1:9`

D

`5:4`

Text Solution

Verified by Experts

The correct Answer is:
D
Since, `R_1 =R_2 implies (l_1)/(K_1 A)=(l_2)/(K_2A) implies (l_1)/(l_2) =(K_1)/(K_2)=5/4`
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