Which three statements describe WLAN RF interaction with environmental situations? (Choose three.)

Question

Options

• AOutdoor rain or indoor humidity affects diffraction.
• BOutdoor rain or indoor humidity affects attenuation.
• CRF frequency is inversely related to attenuation.
• DRF frequency is directly related to attenuation.
• EThe human body affects diffusion.
• FThe human body affects attenuation.

• B
  94% (30)
• C
  3% (1)
• E
  3% (1)

Explanation

Three statements are accurate: (B) Rain and indoor humidity cause attenuation - water molecules absorb RF energy through dielectric absorption, reducing signal strength. This effect intensifies at higher frequencies (e.g., 5 GHz vs. 2.4 GHz). (D) RF frequency is directly related to attenuation - higher frequencies experience greater free-space path loss (as described by the Friis transmission equation: path loss ∝ frequency²) and are absorbed more readily by materials. This is why 5 GHz has shorter range than 2.4 GHz. (F) The human body attenuates RF - the human body is approximately 60% water, absorbing RF energy particularly at 2.4 GHz and 5 GHz, causing 3–6 dB of additional attenuation when a person stands between a client and AP. Choice A is wrong because rain affects attenuation, not diffraction. Choice C is wrong because frequency and attenuation are directly (not inversely) proportional. Choice E is wrong because the human body causes attenuation/absorption, not diffusion.

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