1.

The radiation emitted by a star A is 10,000 times that of the sun. If the surface temperatures of the sun and the star A are 6000 K and 2000 K respectively, the ratio of the radii of the star A and the sun is                                         [EAMCET 2003]

A.            300 : 1                                     
B.            600 : 1
C.            900 : 1                                     
D.            1200 : 1
Answer» D.            1200 : 1


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