Question

both analog and digital waves can experience noise as they travel. noise is any unwanted signal that distorts or reshapes the original wave.
analog and digital waves both need to be amplified after traveling a certain distance. digital waves are amplified by a device known as a digital repeater. analog waves are amplified by a device known as an amplifier.
a digital repeater works by reconstructing a new square wave wave from the incoming wave, even if the incoming wave includes noise. an analog amplifier simply amplifies all of the information it receives, including noise. the diagram below illustrates how the resulting waves might appear.
diagram of analog wave with noise and amplification, and digital wave with noise and amplification
the example above suggests that
○ digital waves cannot have noise or other distortions removed from them.
○ analog waves do not experience as much noise as digital waves.
○ there is no clear advantage to transmitting digital waves over analog waves.
○ noise is less of a problem for digital waves than for analog waves.

Explanation:

1. Analyze the first option: The digital repeater can reconstruct a new square wave from the incoming wave (including noise), so digital waves can have noise removed. Thus, this option is wrong.
2. Analyze the second option: The passage says both analog and digital waves can experience noise, and there's no information showing analog waves have less noise than digital waves. So this option is wrong.
3. Analyze the third option: From the diagram and text, digital waves can reconstruct the original wave after amplification (removing noise), while analog waves amplify noise. So there is an advantage to transmitting digital waves (less affected by noise), so this option is wrong.
4. Analyze the fourth option: As the third option analysis, there is an advantage, so this option is wrong.
5. Analyze the fifth option: Digital repeater can reconstruct the original wave (noise is removed in the process), while analog amplifier amplifies noise. So noise is less of a problem for digital waves. This option is correct.

Answer:

noise is less of a problem for digital waves than for analog waves.