When electrons in the transmitting antenna vibrate 94000 times per second, they produce radiowaves having frequency:
Correct answer: C. 94 kHz
- A. 9.4 kHz
- B. 940 kHz
- C. 94 kHz
- D. None of these
Explanation
This is the correct answer. When electrons in the transmitting antenna vibrate at a frequency of 94,000 times per second, the resulting radio waves have a frequency of 94 kHz. The unit "kHz" stands for kilohertz, which represents a frequency of 1,000 cycles per second. Therefore, 94 kHz corresponds to 94000 cycles per second, which is close to the given vibration frequency. f=94000 Cs-1f=94 x 103 Hz = 94 kHz
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About Alternating Current
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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