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Line-of-sight propagation: Quiz


Question 1: This enables AM radio signals in low-________ environments to be received well after the transmitting antenna has dropped below the horizon.
Noise measurementNoiseNoise (video)Noise (electronics)

Question 2: Thus any obstruction between the transmitting antenna and the receiving antenna will block the signal, just like the ________ that the eye may sense.

Question 3: At low frequencies (below approximately 2 MHz or so) these signals travel as ground waves, which follow the Earth's curvature due to ________ with the layers of atmosphere.
Electromagnetic radiationWavelengthHolographyDiffraction

Question 4: rapid ________ between base stations (roaming)
Universal Mobile Telecommunications SystemCellular networkHandoffCDMA2000

Question 5: The combination of all these effects makes the cellphone propagation environment highly complex, with multipath effects and extensive ________.
Rayleigh fadingMultipath propagationRician fadingNon-line-of-sight propagation

Question 6: This applies as well to RADAR, to Real Time Locating and to ________.
LIDARLightning detectionMeteorologyWeather radar

Question 7: Although the frequencies used by ________ are in the line-of-sight range, they still function in cities.
Universal Mobile Telecommunications System4GSmartphoneMobile phone

Question 8: Especially radio signals, like all ________ including light emissions, travel in straight lines.
Maxwell's equationsClassical electromagnetismElectromagnetic radiationElectromagnetism

Question 9: many ________ (a phone can typically see six at any given time)
Base stationMobile radioTwo-way radioAutomatic vehicle location

Question 10: Low-powered ________ transmitters can be foiled by tree branches, or even heavy rain or snow.
MicrowaveRadio wavesX-rayKu band


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