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Chapter 31: Q. 44 (page 903)
The intensity of sunlight reaching the earth is.
a. What is the power output of the sun
b. What is the intensity of sunlight reaching Mars
a. Power output of the sun is .
b. Intensity of sunlight of mars is.
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Show that the quantity has units of current.
The intensity of sunlight reaching the earth is . Assuming all the sunlight is absorbed, what is the radiation pressure force on the earth Give your answer (a) in newtons and (b) as a fraction of the sun's gravitational force on the earth.
Assume that a -diameter, light bulb radiates all its energy as a single wavelength of visible light. Estimate the electric and magnetic field strengths at the surface of the bulb.
You've recently read about a chemical laser that generates a -diameter, laser beam. One day, after physics class, you start to wonder if you could use the radiation pressure from this laser beam to launch small payloads into orbit. To see if this might be feasible, you do a quick calculation of the acceleration of a -diameter, , perfectly absorbing block. What speed would such a block have if pushed horizontally along a frictionless track by such a laser
Unpolarized light of intensity is incident on a stack of polarizing filters, each with its axis rotated with respect to the previous filter. What light intensity emerges from the last filter?
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