The radiation emitted by a star A is 100...

The radiation emitted by a star `A` is `1000` times that of the sun. If the surface temperature of the sun and star `A` are `6000 K` and `2000 K` respectively. The ratio of the radii of the star `A` and the sun is:

`300:1`

`600:1`

`900:1`

`1200:1`

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