Chapter 24: Q4CQ (page 886)
In which situation shown in Figure\({\rm{24}}{\rm{.24}}\)will the electromagnetic wave be more successful in inducing a current in the wire? Explain.
In situation (a) the electromagnetic wave will be more successful in including a current in the wire.
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In an MRI scan, a higher magnetic field requires higher frequency radio waves to resonate with the nuclear type whose density and location is being imaged. What effect does going to a larger magnetic field have on the most efficient antenna to broadcast those radio waves? Does it favor a smaller or larger antenna?
(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?
Figure 24.26 shows the interference pattern of two radio antennas broadcasting the same signal. Explain how this is analogous to the interference pattern for sound produced by two speakers. Could this be used to make a directional antenna system that broadcasts preferentially in certain directions? Explain
Show that for a continuous sinusoidal electromagnetic wave, the peak intensity is twice the average intensity , using either the fact that , where rms means average (actually root mean square, a type of average).
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.
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