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Assuming a particle to have the form of ...

Assuming a particle to have the form of a sphere and to absorb all incident light, the radius (in mm) of a particle for which its gravitational attraction to the Sun is
Counterbalanced by the force that light exerts on it is------. The power of light radiated by the sun equals `P=4xx10^(26)W` and the density of the particle is `r=1.0 g//cm^(3)`. Use `G=(20)/(3)xx10^(-11)Nm^(2)//kg^(2)`, `pi=(25)/(8)` and mass of the sun `=2xx10^(30)kg`

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