What is the length in feet of a 1-wavelength antenna at 50.0 MHz?

What is the length in feet of a 1-wavelength antenna at 50.0 MHz?

• A. 18.7 ft
• B. 9.36 ft
• C. 37.4 ft
• D. 27.0 ft

Answer: (A)

A 1-wavelength antenna length equals the wavelength of the signal. The wavelength is found from λ = c / f. Using c ≈ 299,792,458 m/s and f = 50.0 MHz (50,000,000 Hz), λ ≈ 5.995 m, which is about 19.69 feet. So the true length is about 19.7 ft. Among the given options, 18.7 ft is the closest match, while the other numbers correspond to roughly λ/2 (about 9.85 ft), a bit more than λ (around 27 ft or 37 ft). Thus 18.7 ft is the best choice.

A 1-wavelength antenna length equals the wavelength of the signal. The wavelength is found from λ = c / f. Using c ≈ 299,792,458 m/s and f = 50.0 MHz (50,000,000 Hz), λ ≈ 5.995 m, which is about 19.69 feet. So the true length is about 19.7 ft. Among the given options, 18.7 ft is the closest match, while the other numbers correspond to roughly λ/2 (about 9.85 ft), a bit more than λ (around 27 ft or 37 ft). Thus 18.7 ft is the best choice.