The heat is flowing through two cylinder...

The heat is flowing through two cylinderical rods of same material. The diameters of the rods are in the ratio `1:2` and their lengths are in the ratio `2:1`. If the temperature difference between their ends is the same, the ratio of rates of flow of heat through them will be

`1 : 1 `

` 2 : 1 `

` 1 : 4 `

` 1 : 8`

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