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Optics - Radiation Intensity

A laser can be used to suspend beads in the earth's gravitational field. A bead with mass 5 * 10^-6 g and density of .400 g/cm^3 is to be suspended. Determine the radiation intensity needed to support the bead.

I'm not sure how to set it up. Help please?

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This solution is provided in 135 words and given in both .doc and .pdf format. Explanation is given for the student to solve the problem themself but workings through the solution are also provided. References are given to further understand the subject.