問題文
An administrator is deciding where to mount antennas inside a concrete office building and wants to reason about how each band behaves around obstacles. Which statement about frequency and wavelength is correct?
選択肢
- The wavelength stretches as the frequency rises and a 5 GHz carrier spans roughly 25 cm against about 12.5 cm at 2.4 GHz.
- The wavelength holds near 12 cm in every 802.11 band and only the amplitude of the wave follows the frequency.
- The wavelength tracks the transmit power rather than the frequency and both of these bands settle near 6 cm at an output of 20 dBm.
- The wavelength shrinks as the frequency rises and a 5 GHz carrier spans roughly 6 cm against about 12.5 cm for the same signal down at 2.4 GHz.