2.
Which describes a compact disc recording?
The spiral is divided into sections of equal time.
A tiny magnet induces an electric current.
The spiral has grooves with wavy patterns.
The recording uses analog technology.
A compact disc recording uses the first choice: the spiral is divided into sections of equal time. This refers to the process of digitally sampling a sound wave, breaking it up into equal sections, and then converting those sections into binary code that can be read by a laser on a CD.
The description that best fits a compact disc recording is "The spiral is divided into sections of equal time." Here's an explanation of why:
To understand this question, we need to know what a compact disc (CD) is and how it works. A CD is a round, flat disc made of plastic that stores audio or data information. It is commonly used to store music or other digital content.
The CD's surface is covered with a thin layer of reflective material, typically aluminum. Data is stored on this reflective surface in the form of tiny pits and lands, which represent the 0s and 1s of binary code. These pits and lands are arranged in a long, continuous spiral track that starts at the center and spirals outward to the edge of the disc.
Now, let's examine the given options:
1. "The spiral is divided into sections of equal time." This statement accurately describes how a CD recording is organized. The spiral track on the CD is divided into sectors of equal length, where each sector corresponds to a specific amount of time. This organization allows for precise and reliable playback of the recorded audio or data.
2. "A tiny magnet induces an electric current." This statement describes how magnetic recordings (such as cassette tapes or hard disk drives) work, not CDs. CDs use optical technology rather than magnetic principles.
3. "The spiral has grooves with wavy patterns." This statement describes how vinyl records work, not CDs. Vinyl records have grooves with wavy patterns that represent the audio signal.
4. "The recording uses analog technology." This statement is incorrect. CDs use digital technology, not analog. The audio or data stored on a CD is represented by binary code (0s and 1s).
In summary, out of the given options, the one that accurately describes a compact disc recording is "The spiral is divided into sections of equal time."