350-401 · Question #1278
What happens to the signal strength of an RF signal due to wave spreading?
The correct answer is B. The signal strength of the RF signal will fall off quickly near the transmitter but more slowly farther. Due to wave spreading, RF signal strength attenuates rapidly in the near field of the transmitter and then falls off more gradually as the distance increases.
Question
What happens to the signal strength of an RF signal due to wave spreading?
Options
- AThe signal strength of the RF signal will fall off equally near the transmitter and also farther away
- BThe signal strength of the RF signal will fall off quickly near the transmitter but more slowly farther
- CThe signal strength of the RF signal will fall off slowly near the receiver and more quickly farther
- DThe signal strength of the RF signal will fall off slowly near the transmitter but more quickly farther
How the community answered
(40 responses)- A3% (1)
- B90% (36)
- C3% (1)
- D5% (2)
Why each option
Due to wave spreading, RF signal strength attenuates rapidly in the near field of the transmitter and then falls off more gradually as the distance increases.
Signal strength does not fall off equally; the rate of attenuation changes with distance.
RF signal strength attenuation due to wave spreading follows an inverse square law in free space. This means the power density decreases rapidly close to the transmitter where the surface area of the expanding sphere increases dramatically, but this rate of decrease becomes slower at greater distances.
The signal strength falls off quickly near the transmitter, not slowly near the receiver, and generally faster initially, then slower with increasing distance.
The signal strength falls off quickly near the transmitter, not slowly, due to the inverse square law where the initial increase in spherical area is most significant.
Concept tested: RF signal attenuation (inverse square law)
Source: https://www.cisco.com/c/en/us/td/docs/wireless/access_point/8-0/configuration/guide/c80cg/c80ch3.html
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