A laser beam is used to levitate a metal disk against the force of Earth's gravity. (a) Derive an equation giving the required intensity of light, I, in terms of the mass m of the disk, the gravitational acceleration g, the speed of light c, and the cross-sectional area of the disk A. Assume the disk is perfectly reflecting and the beam is directed perpendicular to the disk. (Do not substitute numerical values; use variables only.) mgc 24 (b) If the disk has mass 6.27 g and radius 4.20 cm, find the necessary light intensity. 1.22e6 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. W/m2
A laser beam is used to levitate a metal disk against the force of Earth's gravity. (a) Derive an equation giving the required intensity of light, I, in terms of the mass m of the disk, the gravitational acceleration g, the speed of light c, and the cross-sectional area of the disk A. Assume the disk is perfectly reflecting and the beam is directed perpendicular to the disk. (Do not substitute numerical values; use variables only.) mgc 24 (b) If the disk has mass 6.27 g and radius 4.20 cm, find the necessary light intensity. 1.22e6 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. W/m2
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter24: Electromagnetic Waves
Section: Chapter Questions
Problem 28P
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