What is the frequency of X-band (approximately 10 cm) used in radar systems?

• A. 1,000 MHz
• B. 15,000 MHz
• C. 9,375 MHz
• D. 3,000 MHz

Answer: (C)

X-band radar operates in roughly the 8 to 12 GHz range, and that frequency range corresponds to wavelengths of about 2.5 to 3.75 cm. The value 9.375 GHz sits squarely inside this band, making it a representative X-band frequency used by radar systems. At this frequency, the wavelength is about 3.2 cm, which gives a good balance between resolution and atmospheric attenuation for practical radar applications. The other options fall outside X-band: 1,000 MHz is about 1 GHz (lower bands), 3,000 MHz is about 3 GHz (S-band), and 15,000 MHz is about 15 GHz (Ku-band). So 9.375 GHz is the choice that aligns with the typical X-band radar frequency.