Justin is trying to figure out if a signal is analog or digital. The signal is a radio wave with a changing amplitude. Below is the waveform of the signal.
A vertical axis is labeled amplitude, and a horizontal axis is labeled time. A wave with three discrete amplitude levels is shown. There are no amplitudes between them. It begins with a large amplitude and pointy crests and troughs, then is shortened before going flat. Then it increases to a medium amplitude before finally returning to its original amplitude.
A vertical axis is labeled amplitude, and a horizontal axis is labeled time. A wave with three discrete amplitude levels is shown. There are no amplitudes between them. It begins with a large amplitude and pointy crests and troughs, then is shortened before going flat. Then it increases to a medium amplitude before finally returning to its original amplitude.
Is the signal most likely analog or digital, and how do you know?
Choose 1 answer:
Choose 1 answer:

(Choice A)
A
digital, because the wave’s amplitude is always one of a set of values

(Choice B)
B
digital, because the wave’s amplitude can be any value within a range

(Choice C)
C
analog, because the wave’s amplitude is always one of a set of values

(Choice D)
D
analog, because the wave’s amplitude can be any value within a range.