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Spheres P and Q are uniformally construc...

Spheres `P` and `Q` are uniformally constructed from the same material which is good conductor of heat and the radius of `Q` is thrice the radius of `P`. The rate of fall of temperature of `P` is `x` times that of `Q` when both are at the same surface temperture. Find the value of `'x'` :

A

`1//4`

B

`1//3`

C

`3`

D

`4`

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The correct Answer is:
C
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