Kaplan FL9 #60

[aries12r40]

Which of the following would increase the intensity of the EM wave emitted from the antenna?
A. increasing the frequency of the AC generator.
B. increasing the period of the current in the antenna.
C. increasing the length of the two rods.
D. increasing the maximum voltage of the AC generator.

Kaplan's answer is D. But I think Choice A is valid also. Because even though power is discussed in terms of intensity, intensity increases with the square of the amplitude and the square of the frequency for all waves (p. 100, EK content review). Anyone agrees?

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[sleepy425]

Which of the following would increase the intensity of the EM wave emitted from the antenna?
A. increasing the frequency of the AC generator.
B. increasing the period of the current in the antenna.
C. increasing the length of the two rods.
D. increasing the maximum voltage of the AC generator.

Kaplan's answer is D. But I think Choice A is valid also. Because even though power is discussed in terms of intensity, intensity increases with the square of the amplitude and the square of the frequency for all waves (p. 100, EK content review). Anyone agrees?

No, there is a big difference between the frequency of an AC generator and the frequency of electromagnetic radiation. The frequency of an AC generator is just a measure of how often it switches polarity (so like AC current in household circuits is 60 Hz, so it switches polarity 60 times per second). It is not related to the frequency of the emitted EM waves. The frequency of electromagnetic radiation is the number of cycles per second that the wave oscillates.