Chapter 24: Q17CQ (page 886)
Make a list of some everyday objects and decide whether they are transparent or opaque to each of the types of electromagnetic waves.
The list of some objects is:
A wooden block, a glass bottle, and a clean water bottle.
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If electric and magnetic field strengths vary sinusoidally in time, being zero at\({\rm{t = 0}}\), then \({\rm{E = }}{{\rm{E}}_{\rm{0}}}{\rm{sin2\pi ft}}\) and\({\rm{B = }}{{\rm{B}}_{\rm{0}}}{\rm{sin2\pi ft}}\). Let \({\rm{f = 1}}{\rm{.00GHz}}\)here. (a) When are the field strengths first zero? (b) When do they reach their most negative value? (c) How much time is needed for them to complete one cycle?
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.
A researcher measures the wavelength of an electromagnetic wave to be . (a) Calculate the speed at which this wave propagates. (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?
(a) Calculate the rate in watts at which heat transfer through radiation occurs (almost entirely in the infrared) fromof the Earth’s surface at night. Assume the emissivity is 0.90,0.90 ,the temperature of the Earth islocalid="1655871883893" , and that of outer space is 2.7 K. (b) Compare the intensity of this radiation with that coming to the Earth from the Sun during the day, which averages about, only half of which is absorbed. (c) What is the maximum magnetic field strength in the outgoing radiation, assuming it is a continuous wave?
Approximately what is the smallest detail observable with a microscope that uses ultraviolet light of frequency \(1.20 \times {10^{15}}{\rm{ }}Hz\)?
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