Two identical rods of copper and iron are coated with wax uniformly. When water, the length upto which wax melts are 8.4 cm and 4.2 cm respectively. If thermal conductivity of copper is 0.92, then thermal conductivity of iron is :

Two identical rods of copper and iron are coated with wax uniformly. W

1.	Two identical rods of copper and iron are coated with wax uniformly. When water, the length upto which wax melts are 8.4 cm and 4.2 cm respectively. If thermal conductivity of copper is 0.92, then thermal conductivity of iron is :
Answer» `0.23` `0.46` `0.115` `0.69` ANSWER :A

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Two identical rods of copper and iron are coated with wax uniformly. When water, the length upto which wax melts are 8.4 cm and 4.2 cm respectively. If thermal conductivity of copper is 0.92, then thermal conductivity of iron is :

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