What is the 1-wavelength length at 12 MHz?

What is the 1-wavelength length at 12 MHz?

• A. 78 ft
• B. 156 ft
• C. 39 ft
• D. 26 ft

Answer: (A)

Wavelength is found from the speed of propagation divided by frequency: λ = c / f. For radio waves in free space, c ≈ 3.00 × 10^8 m/s. At 12 MHz (12 × 10^6 Hz), the wavelength is λ ≈ (3.00 × 10^8) / (1.2 × 10^7) ≈ 25 meters. Convert to feet: 25 m × 3.28084 ft/m ≈ 82 ft. Among the given choices, 78 ft is the closest match (roughly 24 m), which is a reasonable approximation in practice. The other options correspond to wavelengths that would occur at different frequencies (about 12 m, 48 m, or 8 m equivalents), not 12 MHz.

Wavelength is found from the speed of propagation divided by frequency: λ = c / f. For radio waves in free space, c ≈ 3.00 × 10^8 m/s. At 12 MHz (12 × 10^6 Hz), the wavelength is λ ≈ (3.00 × 10^8) / (1.2 × 10^7) ≈ 25 meters.

Convert to feet: 25 m × 3.28084 ft/m ≈ 82 ft. Among the given choices, 78 ft is the closest match (roughly 24 m), which is a reasonable approximation in practice. The other options correspond to wavelengths that would occur at different frequencies (about 12 m, 48 m, or 8 m equivalents), not 12 MHz.