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28. What frequency range is the High Frequency band?
(a) 100 kHz
(b) 1 GHz
(c) 30 to 300 MHz
(d) 3 to 30 MHz
Explanation
Explanation : The HF band is based on frequencies 3 to 30 Mhz. AM radio stations are in the HF band but normally are stated in kilohertz.
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