When electrons in the transmitting antenna vibrate 94,000 times per second, they produce radio waves having a frequency
Correct answer: C. 94 kHz
- A. 9.4 kHz
- B. 940 kHz
- C. 94 kHz
- D. None of these
Explanation
The frequency of a wave is the number of cycles (or vibrations) per second, measured in Hertz (Hz). Since the electrons vibrate 94,000 times per second, the frequency of the produced radio wave is 94,000 Hz. This is equivalent to 94 kilohertz (kHz).
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Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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