Question #860Radio Theory and Communication Principles
Approximate wavelength of a 21 MHz signal is
- 20 metres
- 15 metres ✓ Correct answer
- 40 metres
- 10 metres
Explanation: Wavelength λ (metres) ≈ 300 / frequency (MHz). 300/21 ≈ 14.3 m → 15 m band.
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