EMI making AM signals prone to static is an example of what interference concept?

EMI making AM signals prone to static is an example of what interference concept?

• A. Frequency hopping
• B. Interference
• C. Noise reduction
• D. Signal amplification

Answer: (B)

Interference is the right idea here. Electromagnetic interference (EMI) happens when unwanted external energy enters the receiver and adds to the desired AM signal. The result is static and distortion because the receiver is effectively hearing two signals at once: the actual broadcast and the EMI. This external energy contaminates the channel, degrading the signal-to-noise ratio. By contrast, frequency hopping is a method to avoid interference, noise reduction targets intrinsic or random noise rather than external signals, and amplification would simply boost signals (and the interference) rather than describe the cause of the static.

Interference is the right idea here. Electromagnetic interference (EMI) happens when unwanted external energy enters the receiver and adds to the desired AM signal. The result is static and distortion because the receiver is effectively hearing two signals at once: the actual broadcast and the EMI. This external energy contaminates the channel, degrading the signal-to-noise ratio. By contrast, frequency hopping is a method to avoid interference, noise reduction targets intrinsic or random noise rather than external signals, and amplification would simply boost signals (and the interference) rather than describe the cause of the static.