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Two spheres of same material have radii ...

Two spheres of same material have radii 1 m and 4 m and temperatures 4000 K and 2000 K respectively. The ratio of the energy radiated per second by the first sphere to that by the second is

A

`1: 1 `

B

`16 : 1`

C

`4 : 1`

D

`1 : 9 `

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The correct Answer is:
A
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