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Q. A spherically-shaped bacteria cell has a mass of 1ug and a diameter of 1.00 um. Suppose the cell completely absorbs light. Take its cross-sectional area to be a circle with a radius equal to that of the cell. You want to use a laser to manipulate the cell.

(i) What intensity laser would you need to levitate the cell?

(ii) Assume that the cell is floating on the surface of water, and that the water surface has a coefficient of friction of u=0.300. You now want to use a laser to move cell horizontally, along the surface of the water. What intensity laser would you require if you wanted cell to attain a horizontal velocity of 1.0 um/s after 15.00 seconds of laser illumination?

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  • Category:- Physics
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