How many bands of frequencies are defined in the material?

• A. 6
• B. 8
• C. 4
• D. 10

Answer: (B)

Frequencies are grouped into discrete bands so we can classify how signals behave, what systems operate in each range, and how propagation and equipment characteristics differ across the spectrum. In this material, the spectrum is defined as eight distinct bands, typically named VLF, LF, MF, HF, VHF, UHF, SHF, and EHF. This eight-band division captures the major differences in propagation and usage without becoming overly granular, providing a clear framework for understanding how different parts of the spectrum are utilized in aviation and communications. Therefore, eight bands is the defined count.