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Chapter 33: Q47P (page 1004)
Light in a vacuum is incident on the surface of a glass slab. In the vacuum, the beam makes an angle ofwith the normal to the surface, while in the glass it makes an angle ofwith the normal. What is the index of refraction of the glass?
The refractive index of glass is .
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In Fig. 33-51, light is incident at angle on a boundary between two transparent materials. Some of the light travels down through the next three layers of transparent materials, while some of it reflects upward and then escapes into the air. Ifand, what is the value of
(a)in the air and
(b) in the bottom material?
The electric component of a beam of polarized light is
.
(a) Write an expression for the magnetic field component of the wave, including a value for .
What are the (b) wavelength, (c) period, and (d) intensity of this light?
(e) Parallel to which axis does the magnetic field oscillate?
(f) In which region of the electromagnetic spectrum is this wave?
Radiation from the Sun reaching Earth (just outside the atmosphere) has an intensity of . (a) Assuming that Earth (and its atmosphere) behaves like a flat disk perpendicular to the Sun’s rays and that all the incident energy is absorbed, calculate the force on Earth due to radiation pressure. (b) For comparison, calculate the force due to the Sun’s gravitational attraction.
Assume (unrealistically) that a TV station acts as a point source broadcasting isotopically at . What is the intensity of the transmitted signal reaching Proxima Centauri, the star nearest our solar system,away? (An alien civilization at that distance might be able to watchXFiles.) A light-year () is the distance light travels in one year.
Question: Frank D. Drake, an investigator in the SETI (Search for Extra-Terrestrial Intelligence) program, once said that the large radio telescope in Arecibo, Puerto Rico (Fig.33-36), “can detect a signal which lays down on the entire surface of the earth a power of only one picowatt.” (a) What is the power that would be received by the Arecibo antenna for such a signal? The antenna diameter is .(b) What would be the power of an isotropic source at the center of our galaxy that could provide such a signal? The galactic center is away. A light-year is the distance light travels in one year.
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