Chapter 24: Q13CQ (page 886)
How do fluorescent soap residues make clothing look “brighter and whiter” in outdoor light? Would this be effective in candlelight?
Ultraviolet radiations are the primary cause.
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The direction of the electric field shown in each part of the Figure 24.5is that produced by the charge distribution in the wire. Justify the direction shown in each part, using the Coulomb force law and the definition of E=F/q, where qis a positive test charge.
Consider electromagnetic fields produced by high voltage power lines. Construct a problem in which you calculate the intensity of this electromagnetic radiation in based on the measured magnetic field strength of the radiation in a home near the power lines. Assume these magnetic field strengths are known to average less than a .
The intensity is small enough that it is difficult to imagine mechanisms for biological damage due to it. Discuss how much energy may be radiating from a section of power line several hundred meters long and compare this to the power likely to be carried by the lines. An idea of how much power this is can be obtained by calculating the approximate current responsible for fields at distances of tens of meters.
(a) What is the wavelength ofradio waves used in an MRI unit? (b) If the frequencies are swept over arange centered on, what is the range of wavelengths broadcast?
In which situation shown in Figure\({\rm{24}}{\rm{.25}}\)will the electromagnetic wave be more successful in inducing a current in the loop? Explain.
Explain why people who have the lens of their eye removed because of cataracts are able to see low-frequency ultraviolet.
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