Compact disc

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/compact-disc

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the co-developers?Philips and Sony
2. What is the standard diameter?120 millimeters (4.7 inches)
3. What is a compact disc and how does it play music?A compact disc is a 120mm round disc that stores music as tiny pits and lands on a shiny surface. A laser in the player shines on the disc, and the changes in reflected light are turned into sound.
4. Why did people start using CDs instead of vinyl records or cassette tapes?CDs are digital, so they don’t wear out or get damaged by dust. They also give clearer, crisper sound than vinyl or cassettes.

CD-DA: The specification for digital audio on compact discs, ensuring high-fidelity sound reproduction.
CD-ROM: Compact Disc Read-Only Memory, a format for storing computer data accessible by laser.
Optical Storage: A data storage technology that uses lasers to read and write information on a disc's surface.
Pits and Lands: Microscopic indentations (pits) and flat areas (lands) on a CD's surface that encode digital data.