Someone plans to float a small, totally absorbing sphere 0.522 m above an isotropic point source of light, so that the upward radiation force from the light matches the downward gravitational force on the sphere. The sphere's density is 20.8 g/cm3, and its radius is 2.20 mm. (a) What power would be required of the light source? (b) Even if such a source were made, would the support of the sphere be unstable? Assume that the speed of light is 2.998*108 m/s.
Someone plans to float a small, totally absorbing sphere 0.522 m above an isotropic point source of light, so that the upward radiation force from the light matches the downward gravitational force on the sphere. The sphere's density is 20.8 g/cm3, and its radius is 2.20 mm. (a) What power would be required of the light source? (b) Even if such a source were made, would the support of the sphere be unstable? Assume that the speed of light is 2.998*108 m/s.
Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter34: Electromagnetic Waves
Section: Chapter Questions
Problem 34.39P: A uniform circular disk of mass m = 24.0 g and radius r = 40.0 cm hangs vertically from a fixed,...
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Transcribed Image Text:*Chapter 33, Problem 023
Someone plans to float a small, totally absorbing sphere 0.522 m above an isotropic point
source of light, so that the upward radiation force from the light matches the downward
gravitational force on the sphere. The sphere's density is 20.8 g/cm3, and its radius is 2.20
mm. (a) What power would be required of the light source? (b) Even if such a source were
made, would the support of the sphere be unstable? Assume that the speed of light is
2.998*108 m/s.
(a) Number
1 Units
(b)
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