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The wax melts up to the length 15 cm and...

The wax melts up to the length 15 cm and 30 cm for two identical rods of different metals in Ingen Hausz apparatus. The ratio of thermal conductivities is :

A

`2:3`

B

`1:2`

C

`1:4`

D

`4:1`

Text Solution

Verified by Experts

The correct Answer is:
C
Here `(k_(1))/(k_(2))=(l_(1)^(2))/(l_(2)^(2))=((15)/(30))^(2)`
`rArr(k_(1))/(k_(2))=1/4`
Thus correct choice is (c ).
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