Question

digital television __________
a. uses a vacuum tube to accept signals and convert them into light and color on the screen.
b. uses a network of stations to transmit signals.
c. provides the illusion of movement by showing a sequence of film over a light source.
d. uses pixels that can be turned on and off.

please select the best answer from the choices provided

○ a
○ b
○ c
○ d

Explanation:

• Option A: Vacuum tubes are used in old - fashioned cathode - ray tube (CRT) televisions, not digital ones.
• Option B: Both analog and digital televisions can use a network of stations (like broadcast networks) to transmit signals, so this is not a unique feature of digital TV.
• Option C: The technique of showing a sequence of film over a light source is related to film projectors or old - style movie - based animation, not digital television.
• Option D: Digital television uses pixels, and each pixel can be turned on or off to create images. This is a key characteristic of digital display technology.

Answer:

D. uses pixels that can be turned on and off.