Learning Materials
Features
Discover
Chapter 24: Q11CQ (page 886)
If you live in a region that has a particular TV station, you can sometimes pick up some of its audio portion on your FM radio receiver. Explain how this is possible. Does it imply that TV audio is broadcast as FM?
This does not imply that audio from television is carried on FM.
Over 30 million students worldwide already upgrade their learning with 91影视!
All the tools & learning materials you need for study success - in one app.
Get started for free
Verify that the correct value for the speed of light \(c\)is obtained when numerical values for the permeability and permittivity of free space (\({\mu _0}\)and \({\varepsilon _0}\)) are entered into the equation \(c = \frac{1}{{\sqrt {{\mu _0}{\varepsilon _0}} }}\).
Show that, when SI units for \({\mu _0}\) and \({\varepsilon _0}\) are entered, the units given by the right-hand side of the equation in the problem above are \(m/s\).
TV-reception antennas for VHF are constructed with cross wires supported at their centers, as shown in Figure \({\rm{24}}{\rm{.27}}\). The ideal length for the cross wires is one-half the wavelength to be received, with the more expensive antennas having one for each channel. Suppose you measure the lengths of the wires for particular channels and find them to be \({\rm{1}}{\rm{.94}}\) and \({\rm{0}}{\rm{.753\;m}}\) long, respectively. What are the frequencies for these channels?
(a) What is the frequency of the \(193 - nm\)ultraviolet radiation used in laser eye surgery? (b) Assuming the accuracy with which this EM radiation can ablate the cornea is directly proportional to wavelength, how much more accurate can this UV be than the shortest visible wavelength of light?
Laser vision correction often uses an excimer laser that produces electromagnetic radiation. This wavelength is extremely strongly absorbed by the cornea and ablates it in a manner that reshapes the cornea to correct vision defects. Explain how the strong absorption helps concentrate the energy in a thin layer and thus give greater accuracy in shaping the cornea. Also, explain how this strong absorption limits damage to the lens and retina of the eye.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Flashcards 
91影视 AI 
Notes 
Study Plans 
Study Sets 
Find a degree 
Magazine