If the ratio of coefficient of thermal conductivity of silver and copper is $10 : 9$ , then the ratio of the lengths upto which wax will melt in Ingen Hausz experiment will be

  • A

    $6:10$

  • B

    $\sqrt {10} :3$

  • C

    $100 : 81$

  • D

    $81 : 100$

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