In the Ingen Hauz’s experiment the wax melts up to lengths $10$ and $25 cm$ on two identical rods of different materials. The ratio of thermal conductivities of the two materials is
In the Ingen Hauz’s experiment the wax melts up to lengths $10$ and $25 cm$ on two identical rods of different materials. The ratio of thermal conductivities of the two materials is
- A
$1:6.25$
- B
$6.25 : 1$
- C
$1:\sqrt {2.5} $
- D
$1:2.5$
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- [AIPMT 2015]