Question

Extra Credit: In our solar system, large dust particles, similar in size to soot and sand grains, are common but smaller particles are largely absent. It is believed that these smaller particles have been blown out of the solar system by the radiation force exerted on them by the Sun. Assume that the dust particles are spherical, completely absorb all incident radiation from the Sun, and have a density of 2,000 kg/m3. Determine the diameter, in nanometers, of the smallest particle that could remain in the solar system for long periods of time. (The Sun's power output is 3.9 x 1020 W.)

Answer 1

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