The part of electromagnetic spectrum, defined as radio and microwaves, can be further divided into eight ranges, called bands. These bands are rated from very low frequency (VLF) to Extremely High frequency (EHF) Very Low Frequency :: These waves propagate as surface waves, usually through air, sometimes through water. VLF may be affected by atmospheric noise. VLF waves are usually used for long range radio navigation and submarine communication. Low Frequency :: these waves propagate…"The Parts of Electromagnetic Spectrum."