ATPL EASA Radio Navigation Practice Exam

Question: 1 / 400

What is the wavelength classification for Extremely High Frequency?

100 - 10 km

The correct classification for the Extremely High Frequency (EHF) band typically ranges from 30 GHz to 300 GHz, which corresponds to wavelengths from 1 cm to 10 cm, or 0.01 m to 0.1 m. This places EHF well within the boundary of the last choice provided, which extends from 100 m to 1 m, pertaining to very low frequencies rather than EHF.

The other ranges mentioned do not accurately reflect the characteristics of the EHF. For example, the range of 10 - 1 km refers to Low Frequency (LF) and Medium Frequency (MF), and 1 km - 100 m corresponds to the High Frequency (HF) and Very High Frequency (VHF) bands. The range of 100 km - 10 km spans the Ultra High Frequency (UHF) band and does not define the wavelengths of EHF. Overall, choosing the 100 m - 1 m range would align with the true properties of the Extremely High Frequency classification.

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10 - 1 km

1 km - 100 m

100 m - 1 m

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